Flora of the Houtman Abrolhos

This is a list of the terrestrial flora of the Houtman Abrolhos. Only vascular plants are listed — there have been some collections of mosses, liverworts and lichens from the Houtman Abrolhos, but no information has been published on these non-vascular groups.

The distribution of each species within each island group is provided. A list of islands is provided for species that occur on fewer than ten islands in a group; for species that occur on ten or more islands in a group, an island count is provided. Islands without a formally gazetted name are referred to by informal names, given in quotation marks.

A grey background indicates a naturalised species.

{| class="wikitable" ! rowspan="2" | Scientific name ! rowspan="2" | Common name ! colspan="3" | Distribution ! rowspan="2" | Remarks ! rowspan="2" | Image ! Wallabi Group (45 islands) !! Easter Group (34 islands) !! Pelsaert Group (41 islands) ! colspan="7" style="text-align:left"|

Aizoaceae
! colspan="7" style="text-align:left"|
 * Carpobrotus sp.
 * || || Rat I. || || ||
 * Carpobrotus virescens
 * Coastal Pigface || 13 islands || 25 islands || 23 islands || ||
 * Disphyma crassifolium subsp. clavellatum
 * Round-leaved Pigface || Pigeon I. || Leo I., Rat I. || || || Disphyma crassifolium subsp. clavellatum.jpg
 * - style="background:#CCCCCC;"
 * Mesembryanthemum crystallinum
 * Iceplant || 40 islands || 18 islands || 30 islands || Naturalised || [[Image:Unk desert flower 2.jpg|100px]]
 * Sesuvium portulacastrum
 * || || Campbell I. || || || [[Image:Sesuvium p.jpg|100px]]
 * - style="background:#CCCCCC;"
 * Tetragonia decumbens
 * Sea Spinach || || Crake I., Keru I., White I., Wooded I. || || Naturalised ||
 * || || Campbell I. || || || [[Image:Sesuvium p.jpg|100px]]
 * - style="background:#CCCCCC;"
 * Tetragonia decumbens
 * Sea Spinach || || Crake I., Keru I., White I., Wooded I. || || Naturalised ||

Amaranthaceae
! colspan="7" style="text-align:left"|
 * Ptilotus divaricatus
 * Climbing Mulla Mulla || East Wallabi I. || || || ||
 * Ptilotus eriotrichus
 * || East Wallabi I., West Wallabi I. || || || ||
 * Ptilotus gaudichaudii
 * || East Wallabi I. || Serventy I. || || ||
 * Ptilotus obovatus
 * Cotton Bush || East Wallabi I. || || || ||
 * Ptilotus villosiflorus
 * || West Wallabi I. || || || ||
 * Ptilotus obovatus
 * Cotton Bush || East Wallabi I. || || || ||
 * Ptilotus villosiflorus
 * || West Wallabi I. || || || ||
 * || West Wallabi I. || || || ||

Anthericaceae
! colspan="7" style="text-align:left"|
 * Thysanotus patersonii
 * || East Wallabi I., North I., Pigeon I., Seagull I., West Wallabi I. || || || || Thysanotus patersonii.jpg
 * || East Wallabi I., North I., Pigeon I., Seagull I., West Wallabi I. || || || || Thysanotus patersonii.jpg

Apiaceae
! colspan="7" style="text-align:left"|
 * Apium annuum
 * || East Wallabi I., West Wallabi I. || Alexander I., Campbell I., Serventy I. || || ||
 * Apium prostratum
 * Sea Celery || Tattler I. || || Middle I. || || Apium prostratum var. filiforme2.JPG
 * Daucus glochidiatus
 * Australian Carrot || East Wallabi I., North I., Pigeon I., West Wallabi I. || Campbell I., Keru I., White I. || Middle I. || ||
 * Hydrocotyle diantha
 * || East Wallabi I., West Wallabi I. || Rat I. || Basile I., Middle I.|| ||
 * - style="background:#CCCCCC;"
 * Petroselinum crispum
 * Parsley || || Little Rat I., Rat I., Roma I. || || Naturalised || [[Image:Parsley Curled.jpg|100px]]
 * Trachymene pilosa
 * Native Parsnip || East Wallabi I. || || || ||
 * Petroselinum crispum
 * Parsley || || Little Rat I., Rat I., Roma I. || || Naturalised || [[Image:Parsley Curled.jpg|100px]]
 * Trachymene pilosa
 * Native Parsnip || East Wallabi I. || || || ||
 * Native Parsnip || East Wallabi I. || || || ||

Apocynaceae
! colspan="7" style="text-align:left"|
 * Alyxia buxifolia
 * Dysentery Bush || East Wallabi I., Seagull I. and West Wallabi I. || || || || Alyxia buxifolia.jpg
 * Dysentery Bush || East Wallabi I., Seagull I. and West Wallabi I. || || || || Alyxia buxifolia.jpg

Asclepiadaceae
! colspan="7" style="text-align:left"|
 * Sarcostemma viminale subsp. australe
 * || "Eagle Point Islet", East Wallabi I., Oystercatcher I., Pigeon I., Seagull I. and West Wallabi I. || || Basile I., Middle I. || ||
 * || "Eagle Point Islet", East Wallabi I., Oystercatcher I., Pigeon I., Seagull I. and West Wallabi I. || || Basile I., Middle I. || ||

Asphodelaceae
! colspan="7" style="text-align:left"|
 * Bulbine semibarbata
 * Leek Lily || "Eagle Point Islet", East Wallabi I., Little Pigeon I., North I., Pigeon I. and West Wallabi I. || Rat I. || Middle I., Pelsaert I. || ||
 * Leek Lily || "Eagle Point Islet", East Wallabi I., Little Pigeon I., North I., Pigeon I. and West Wallabi I. || Rat I. || Middle I., Pelsaert I. || ||

Asteraceae
! colspan="7" style="text-align:left"|
 * Actinobole condensatum
 * || East Wallabi I., North I., West Wallabi I. || || || ||
 * Actites megalocarpa
 * Dune Thistle || Little Pigeon I., Long I., Oystercatcher I., Pigeon I., Seagull I. || || Pelsaert I. || ||
 * Angianthus tomentosus
 * Camel-grass || East Wallabi I. || || || ||
 * Brachyscome ciliaris
 * || East Wallabi I., North I., Pigeon I. || Little Rat I. || || ||
 * Brachyscome iberidifolia
 * || East Wallabi I. || || || || [[Image:Brachyscome iberidifolia1.jpg|100px]]
 * Calocephalus aervoides
 * Woolly Beauty-heads || East Wallabi I., West Wallabi I.|| || || Rated "Priority Three - Poorly Known Taxa" in the Department of Environment and Conservation's Declared Rare and Priority Flora List. ||
 * Chthonocephalus tomentellus
 * || West Wallabi I. || || || Rated "Priority Two - Poorly Known Taxa" in the Department of Environment and Conservation's Declared Rare and Priority Flora List. ||
 * - style="background:#CCCCCC;"
 * Conyza bonariensis
 * Flaxleaf Fleabane || Little Pigeon I., Pigeon I. || Bushby I., Little Rat I., Rat I., Roma I. || || Naturalised || [[Image:Conyza bonariensis.jpg|100px]]
 * - style="background:#CCCCCC;"
 * Conyza sumatrensis
 * Tall Fleabane || || Rat I. || || Naturalised. Harvey et al. (2001) lists C. albida, but this is now a taxonomic synonym of C. sumatrensis. || [[Image:W ooaretinogiku3111.jpg|100px]]
 * - style="background:#CCCCCC;"
 * Erigeron karvinskianus
 * || || || Gun I., Murray I. || Naturalised || [[Image:Erigeron karvinskianus2.jpg|100px]]
 * Euchiton sphaericus
 * || East Wallabi I., North I. || Rat I. || || || [[Image:Starr 030419-0181 Gnaphalium sp..jpg|100px]]
 * Gnaphalium indutum
 * Tiny Cudweed || East Wallabi I. || Leo I. || || ||
 * - style="background:#CCCCCC;"
 * Helichrysum luteoalbum
 * Jersey Cudweed || East Wallabi I., North I., Turnstone I., West Wallabi I. || Little Rat I., Rat I. || || Naturalised. Harvey et al. (2001) lists Pseudognaphalium luteoalbum, but this is now a nomenclatural synonym of Helichrysum luteoalbum. || [[Image:Pseudognaphalium01.jpg|100px]]
 * - style="background:#CCCCCC;"
 * Hypochaeris glabra
 * Smooth Catsear || || || Basile I. || Naturalised || [[Image:Hypochaeris glabra Sturm40.jpg|100px]]
 * - style="background:#CCCCCC;"
 * Lactuca saligna
 * Wild Lettuce || Pigeon I. || || || Naturalised || [[Image:Lactuca saligna Sturm46.jpg|100px]]
 * Olearia axillaris
 * Coastal Daisybush || Eastern I., East Wallabi I., Long I., North I., Pigeon I., Turnstone I., West Wallabi I. || Campbell I. || || || Olearia axillaris.jpg
 * Podotheca angustifolia
 * Sticky Longheads || North I., West Wallabi I. || || || ||
 * - style="background:#CCCCCC;"
 * Reichardia tingitana
 * False Sowthistle || || Campbell I., Rat I. || Basile I., Middle I. || Naturalised || [[Image:Starr 050516-1280 Reichardia tingitana.jpg|100px]]
 * Senecio glossanthus
 * Slender Groundsel || East Wallabi I., North I., West Wallabi I. || || || ||
 * Senecio pinnatifolius
 * || 23 islands || 17 islands || 16 islands || Harvey et al. (2001) lists S. lautus but this name has been misapplied in Western Australia to S. pinnatifolius. ||
 * - style="background:#CCCCCC;"
 * Sonchus oleraceus
 * Common Sowthistle || 20 islands || 19 islands || 16 islands || Naturalised. Harvey et al. (2001) lists both S. oleraceus and S. tenerrimus on four islands, and S. tenerrimus alone on another. However, the latter name is now considered a misapplication against the former in Western Australia, so here the entries for these names have been pooled. || [[Image:2006-11-16Sonchus oleraceus03-03.jpg|100px]]
 * - style="background:#CCCCCC;"
 * Urospermum picroides
 * False Hawkbit || 10 islands || 10 islands || Burnett Rock, Burton I., Gun I., Post Office I., Uncle Margie I. || Naturalised || [[Image:Urosperme fausse picride.jpg|100px]]
 * - style="background:#CCCCCC;"
 * Ursinia anthemoides
 * Ursinia || || Alexander I., Leo I., Serventy I., White I. || Burnett Rock, Burton I. || Naturalised. ||
 * Vittadinia cuneata var. cuneata
 * Woolly Vittadinia || Akerstrom I., Barge Rock, East Wallabi I., Marinula I., Seagull I., Turnstone I. || || || ||
 * Vittadinia sp.
 * || East Wallabi I. || || || ||
 * - style="background:#CCCCCC;"
 * Sonchus oleraceus
 * Common Sowthistle || 20 islands || 19 islands || 16 islands || Naturalised. Harvey et al. (2001) lists both S. oleraceus and S. tenerrimus on four islands, and S. tenerrimus alone on another. However, the latter name is now considered a misapplication against the former in Western Australia, so here the entries for these names have been pooled. || [[Image:2006-11-16Sonchus oleraceus03-03.jpg|100px]]
 * - style="background:#CCCCCC;"
 * Urospermum picroides
 * False Hawkbit || 10 islands || 10 islands || Burnett Rock, Burton I., Gun I., Post Office I., Uncle Margie I. || Naturalised || [[Image:Urosperme fausse picride.jpg|100px]]
 * - style="background:#CCCCCC;"
 * Ursinia anthemoides
 * Ursinia || || Alexander I., Leo I., Serventy I., White I. || Burnett Rock, Burton I. || Naturalised. ||
 * Vittadinia cuneata var. cuneata
 * Woolly Vittadinia || Akerstrom I., Barge Rock, East Wallabi I., Marinula I., Seagull I., Turnstone I. || || || ||
 * Vittadinia sp.
 * || East Wallabi I. || || || ||
 * Vittadinia sp.
 * || East Wallabi I. || || || ||

Avicenniaceae
! colspan="7" style="text-align:left"|
 * Avicennia marina
 * White Mangrove || Akerstrom I., "East Mangrove I.", Marinula I., Oystercatcher I., Seagull I., Tattler I., Turnstone I., West Wallabi I. || Alexander I., Campbell I., Keru I., Little Rat I., "Little Stokes I.", Morley I., Serventy I., Suomi I., Wooded I. || 14 islands || || [[Image:Avic marin 070728 020 mank.jpg|100px]]
 * White Mangrove || Akerstrom I., "East Mangrove I.", Marinula I., Oystercatcher I., Seagull I., Tattler I., Turnstone I., West Wallabi I. || Alexander I., Campbell I., Keru I., Little Rat I., "Little Stokes I.", Morley I., Serventy I., Suomi I., Wooded I. || 14 islands || || [[Image:Avic marin 070728 020 mank.jpg|100px]]

Boraginaceae
! colspan="7" style="text-align:left"|
 * Cynoglossum australe
 * Australian Hound's-tongue || East Wallabi I., West Wallabi I. || || || Harvey et al. (2001) lists this species, but according to FloraBase it does not occur in Western Australia. ||
 * - style="background:#CCCCCC;"
 * Echium plantagineum
 * Paterson's Curse || East Wallabi I. || || || Naturalised; classed as a noxious weed. || [[Image:Echium plantagineum2.jpg|100px]]
 * Trichodesma zeylanicum
 * Camel Bush || North I. || || || || Trichodesma zeylanicum flower.jpg
 * Trichodesma zeylanicum
 * Camel Bush || North I. || || || || Trichodesma zeylanicum flower.jpg

Brassicaceae
! colspan="7" style="text-align:left"|
 * - style="background:#CCCCCC;"
 * Brassica rapa
 * || Beacon I. || || || Naturalised || [[Image:Brassica rapa plant.jpg|100px]]
 * - style="background:#CCCCCC;"
 * Cakile maritima
 * Sea Rocket || 10 islands || 13 islands || 12 islands || Naturalised || [[Image:Cakile-maritima-(eurMeersenf) 1.jpg|100px]]
 * - style="background:#CCCCCC;"
 * Hornungia procumbens
 * Oval Purse || 14 islands || Bynoe I., Leo I., Morley I., Serventy I. || Burton I., Pelsaert I. || Naturalised. Harvey et al. (2001) lists Hornungia procumbens on 13 islands, and Hymenolobus procumbens on another, but the latter name is now considered a synonym of the former. ||
 * Lepidium lyratogynum
 * || Eastern I. || Bynoe I., Leo I., Little North I., White I. || || ||
 * Lepidium pseudoruderale
 * || Beacon I., Dakin I., Dick I., Eastern I., Saville-Kent I., Seal I. || || Burnett Rock, Burton I., Coronation I., Jackson I., "Little Jackson I.", Newman I., Pelsaert I., Post Office I., Square I. || ||
 * Lepidium puberulum
 * || Eastern I., "First Sister Islet" || 10 islands || || Rated "Priority Four — Rare Taxa" in the Department of Environment and Conservation's system of Declared Rare and Priority Flora List. ||
 * - style="background:#CCCCCC;"
 * Raphanus raphanistrum
 * Wild radish || Pigeon I. || Alexander I., Little Rat I., Rat I., Serventy I. || Basile I., Gun I., Murray I., Pelsaert I., Post Office I. || Naturalised || [[Image:(MHNT) Raphanus raphanistrum - flowers.jpg|100px]]
 * - style="background:#CCCCCC;"
 * Raphanus sativus
 * Radish || || Alexander I. || Basile I., Burnett Rock || Naturalised || [[Image:Radieschen.jpg|100px]]
 * - style="background:#CCCCCC;"
 * Sisymbrium irio
 * London Rocket || || Suomi I. || || Naturalised || [[Image:Sisymbrium irio.jpg|100px]]
 * - style="background:#CCCCCC;"
 * Sisymbrium orientale
 * Indian Hedge Mustard || Beacon I. || Little Rat I., Rat I. || Burnett Rock || Naturalised || [[Image:Sisymbrium orientale02.jpg|100px]]
 * - style="background:#CCCCCC;"
 * Sisymbrium orientale
 * Indian Hedge Mustard || Beacon I. || Little Rat I., Rat I. || Burnett Rock || Naturalised || [[Image:Sisymbrium orientale02.jpg|100px]]

Cactaceae
! colspan="7" style="text-align:left"|
 * - style="background:#CCCCCC;"
 * Opuntia stricta
 * Common Prickly Pear || || Rat I. || Basile I. || Naturalised || [[Image:Opuntia12 filtered.jpg|100px]]

Campanulaceae
! colspan="7" style="text-align:left"|
 * Wahlenbergia gracilis
 * || || Rat I. || || || [[Image:Starr 050817-3868 Wahlenbergia gracilis.jpg|100px]]
 * Wahlenbergia multicaulis
 * || || Rat I. || || ||
 * Wahlenbergia multicaulis
 * || || Rat I. || || ||

Capparaceae
! colspan="7" style="text-align:left"|
 * Capparis spinosa
 * Coastal Caper || "Eagle Point Islet", East Wallabi I., Little Pigeon I., Oystercatcher I., Pigeon I., Seagull I., Tattler I., Turnstone I., West Wallabi I. || || || || Capparis_zoharyi_4.jpg
 * Coastal Caper || "Eagle Point Islet", East Wallabi I., Little Pigeon I., Oystercatcher I., Pigeon I., Seagull I., Tattler I., Turnstone I., West Wallabi I. || || || || Capparis_zoharyi_4.jpg

Caryophyllaceae
! colspan="7" style="text-align:left"|
 * - style="background:#CCCCCC;"
 * Cerastium glomeratum
 * Mouse Ear Chickweed || || || Eight I., Three I. || Naturalised || [[Image:Cerastium glomeratum1.jpg|100px]]
 * - style="background:#CCCCCC;"
 * Petrorhagia dubia
 * Velvet Pink || || Rat I. || || Naturalised. Harvey et al. (2001) lists P. velutina, but this is now a taxonomic synonym of P. dubia. || Petrorhagiadubia.jpg
 * - style="background:#CCCCCC;"
 * Polycarpon tetraphyllum
 * Fourleaf Allseed || East Wallabi I., Little Pigeon I., Pigeon I. || Little Roma I. || Basile I., Jackson I. || Naturalised || [[Image:Polycarpon tetraphyllum.jpg|100px]]
 * - style="background:#CCCCCC;"
 * Sagina apetala
 * Annual Pearlwort || East Wallabi I. || || || Naturalised ||
 * - style="background:#CCCCCC;"
 * Silene gallica
 * French Catchfly || || White I. || || Naturalised || [[Image:Silene gallica fleur.JPG|100px]]
 * - style="background:#CCCCCC;"
 * Silene nocturna
 * Mediterranean Catchfly || || Alexander I., Bynoe I., Little Rat I., Morley I., Serventy I. || || Naturalised ||
 * - style="background:#CCCCCC;"
 * Spergularia diandra
 * Lesser Sand Spurry || || || Gun I. || Naturalised ||
 * - style="background:#CCCCCC;"
 * Spergularia rubra
 * Sand Spurry || 12 islands || Little Rat I., Roma I. || Pelsaert I., Three I. || Naturalised || [[Image:Rode schijnspurrie Spergularia rubra.jpg|100px]]
 * Spergularia sp. 5 Leeman
 * || || Rat I. || || Harvey et al. (2001) lists S. nesophila, but this is an unpublished manuscript name, which is considered a nomenclatural synonym of the above. ||
 * - style="background:#CCCCCC;"
 * Stellaria media
 * Chickweed || West Wallabi I. || || || Naturalised || [[Image:StellariaMedia001.JPG|100px]]
 * Chickweed || West Wallabi I. || || || Naturalised || [[Image:StellariaMedia001.JPG|100px]]

Celastraceae
! colspan="7" style="text-align:left"|
 * Stackhousia sp.
 * || West Wallabi I. || || || Harvey et al. (2001) lists this under Stackhousiaceae, but it is now generally treated under Celastraceae. ||
 * Stackhousia sp.
 * || East Wallabi I., North I., West Wallabi I. || || || Harvey et al. (2001) lists this as Stackhousia viminea, but this name has been misapplied in Western Australia against three species: S. clementii, S. muricata and S. intermedia. Harvey et al. (2001) treats Stackhousia under Stackhousiaceae, but it is now generally treated under Celastraceae. ||
 * Tripterococcus brunonis
 * || East Wallabi I. || || || Harvey et al. (2001) lists this under Stackhousiaceae, but it is now generally treated under Celastraceae. ||
 * Tripterococcus brunonis
 * || East Wallabi I. || || || Harvey et al. (2001) lists this under Stackhousiaceae, but it is now generally treated under Celastraceae. ||
 * || East Wallabi I. || || || Harvey et al. (2001) lists this under Stackhousiaceae, but it is now generally treated under Celastraceae. ||

Chenopodiaceae
! colspan="7" style="text-align:left"|
 * Atriplex amnicola
 * Swamp Saltbush || || || Gun I., Murray I., Pelsaert I. || || Atriplex amnicola.jpg
 * Atriplex bunburyana
 * Silver Saltbush || || Rat I. || || ||
 * Atriplex cinerea
 * Grey Saltbush || 27 islands || 21 islands || 22 islands || || Atriplex cinerea.jpg
 * Atriplex paludosa
 * Marsh Saltbush || Little Pigeon I., Long I., Mangrove I., North I., Pelican I., Pigeon I., Tattler I., West Wallabi I. || || || || Atriplex paludosa.jpg
 * Atriplex paludosa subsp. baudinii
 * || || Rat I. || || ||
 * Atriplex vesicaria subsp. variabilis
 * Bladder Saltbush || Seagull I. || || || ||
 * Atriplex sp.
 * Saltbush || 17 islands || 10 islands || 18 islands || ||
 * - style="background:#CCCCCC;"
 * Chenopodium album
 * Fat Hen || || Rat I. || || Naturalised || [[Image:Chenopodium album a1.jpg|100px]]
 * Chenopodium melanocarpum
 * Black Crumbweed || East Wallabi I. || || || ||
 * - style="background:#CCCCCC;"
 * Chenopodium murale
 * Nettle-leaf Goosefoot || Beacon I., North I., Pelican I., West Wallabi I. || Alexander I., Joe Smith I., "Landscope I.", "Nitraria I.", Rat I., Wooded I. || Burton I., Gun I., "Little Jackson I.", Pelsaert I., Square I., Uncle Margie I. || Naturalised || [[Image:Starr 040125-0029 Chenopodium murale.jpg|100px]]
 * Chenopodium nitrariaceum
 * Nitre Goosefoot || East Wallabi I., West Wallabi I. || || || ||
 * Dysphania plantaginella
 * || East Wallabi I. || || || ||
 * Enchylaena tomentosa
 * Barrier Saltbush || 26 islands || 11 islands || 17 islands || ||
 * Rhagodia baccata
 * Berry Saltbush || Akerstrom I., East Wallabi I., North I., Oystercatcher I., Pigeon I., Seagull I., Tattler I., Turnstone I., West Wallabi I. || || || ||
 * Rhagodia latifolia
 * || Akerstrom I., "Eagle Point Islet", Little Pigeon I., North I., Pigeon I. || || || ||
 * Rhagodia preissii subsp. obovata
 * || || Little Rat I., Rat I. || || ||
 * Rhagodia sp.
 * || || Rat I. || || ||
 * - style="background:#CCCCCC;"
 * Salsola kali
 * Prickly Saltwort || Dick I., Eastern I., East Wallabi I., Long I., North I., Seal I., Third Sister, West Wallabi I. || Bynoe I., Campbell I., Crake I., Leo I., Morley I., Rat I. || Basile I., Coronation I., Pelsaert I., Stick I. || Naturalised || [[Image:Salsola kali habito.jpg|100px]]
 * Sarcocornia quinqueflora
 * Beaded Samphire || 17 islands || 19 islands || 15 islands || || Sarcocornia quinqueflora.jpg
 * Suaeda australis
 * Seablite || 11 islands || "Nitraria I.", Tapani I., Wooded I. || Newman I., Pelsaert I. || ||
 * Tecticornia arbuscula
 * || East Wallabi I., North I., Pigeon I., West Wallabi I. || || Gun I., Middle I., Murray I., Pelsaert I. || Harvey et al. (2001) listed Sclerostegia arbuscula, but all Sclerostegia were transferred into Tecticornia in 2007. || Tecticornia arbuscula.jpg
 * Tecticornia halocnemoides
 * Shrubby Samphire || Akerstrom I., Alcatraz I., Barge Rock, East Wallabi I., North I., Pigeon I., Shag Rock, West Wallabi I. || 13 islands || 25 islands || Harvey et al. (2001) listed Halosarcia halocnemoides, but all Halosarcia were transferred into Tecticornia in 2007. ||
 * Tecticornia lepidosperma subsp. bidens
 * || Akerstrom I. || Little Rat I., Rat I. || Lagoon I., Pelsaert I. || Harvey et al. (2001) listed Halosarcia indica subsp. bidens, but all Halosarcia were transferred into Tecticornia in 2007. ||
 * Tecticornia sp.
 * Samphire || West Wallabi I. || || || Harvey et al. (2001) listed Halosarcia sp., but all Halosarcia were transferred to Tecticornia in 2007. ||
 * Threlkeldia diffusa
 * Coast Bonefruit || 33 islands || 19 islands || 20 islands || || Threlkeldia diffusa.jpg
 * Prickly Saltwort || Dick I., Eastern I., East Wallabi I., Long I., North I., Seal I., Third Sister, West Wallabi I. || Bynoe I., Campbell I., Crake I., Leo I., Morley I., Rat I. || Basile I., Coronation I., Pelsaert I., Stick I. || Naturalised || [[Image:Salsola kali habito.jpg|100px]]
 * Sarcocornia quinqueflora
 * Beaded Samphire || 17 islands || 19 islands || 15 islands || || Sarcocornia quinqueflora.jpg
 * Suaeda australis
 * Seablite || 11 islands || "Nitraria I.", Tapani I., Wooded I. || Newman I., Pelsaert I. || ||
 * Tecticornia arbuscula
 * || East Wallabi I., North I., Pigeon I., West Wallabi I. || || Gun I., Middle I., Murray I., Pelsaert I. || Harvey et al. (2001) listed Sclerostegia arbuscula, but all Sclerostegia were transferred into Tecticornia in 2007. || Tecticornia arbuscula.jpg
 * Tecticornia halocnemoides
 * Shrubby Samphire || Akerstrom I., Alcatraz I., Barge Rock, East Wallabi I., North I., Pigeon I., Shag Rock, West Wallabi I. || 13 islands || 25 islands || Harvey et al. (2001) listed Halosarcia halocnemoides, but all Halosarcia were transferred into Tecticornia in 2007. ||
 * Tecticornia lepidosperma subsp. bidens
 * || Akerstrom I. || Little Rat I., Rat I. || Lagoon I., Pelsaert I. || Harvey et al. (2001) listed Halosarcia indica subsp. bidens, but all Halosarcia were transferred into Tecticornia in 2007. ||
 * Tecticornia sp.
 * Samphire || West Wallabi I. || || || Harvey et al. (2001) listed Halosarcia sp., but all Halosarcia were transferred to Tecticornia in 2007. ||
 * Threlkeldia diffusa
 * Coast Bonefruit || 33 islands || 19 islands || 20 islands || || Threlkeldia diffusa.jpg
 * || Akerstrom I. || Little Rat I., Rat I. || Lagoon I., Pelsaert I. || Harvey et al. (2001) listed Halosarcia indica subsp. bidens, but all Halosarcia were transferred into Tecticornia in 2007. ||
 * Tecticornia sp.
 * Samphire || West Wallabi I. || || || Harvey et al. (2001) listed Halosarcia sp., but all Halosarcia were transferred to Tecticornia in 2007. ||
 * Threlkeldia diffusa
 * Coast Bonefruit || 33 islands || 19 islands || 20 islands || || Threlkeldia diffusa.jpg
 * Threlkeldia diffusa
 * Coast Bonefruit || 33 islands || 19 islands || 20 islands || || Threlkeldia diffusa.jpg

Colchicaceae
! colspan="7" style="text-align:left"|
 * Wurmbea monantha
 * || East Wallabi I., North I., West Wallabi I. || Alexander I., Serventy I. || || ||
 * || East Wallabi I., North I., West Wallabi I. || Alexander I., Serventy I. || || ||

Convolvulaceae
! colspan="7" style="text-align:left"|
 * - style="background:#CCCCCC;"
 * Ipomoea cairica
 * || || Little Rat I. || || Naturalised || [[Image:Ipomoea cairica.jpg|100px]]

Crassulaceae
! colspan="7" style="text-align:left"|
 * - style="background:#CCCCCC;"
 * Bryophyllum delagoense
 * Mother of Millions || Pigeon I. || Rat I. || || Naturalised. In 2000 this poisonous weed was found to have colonised over half of Rat and Pigeon Islands. || [[Image:Kalanchoe tubiflora01.jpg|100px]]
 * Crassula colorata
 * Dense Stonecrop || Dick I., Eastern I., East Wallabi I., Long I., North I., Tattler I., West Wallabi I. || 10 islands || Basile I., Burton I., Middle I., Pelsaert I., Stick I. || ||
 * Crassula exserta
 * || || Bynoe I., Campbell I., Leo I., White I. || || ||
 * Cotyledon orbiculata
 * || Dick I., Eastern I., Pigeon I., West Wallabi I. || || || || [[Image:Cotyledon orbiculata 01 Pengo.jpg|100px]]
 * Cotyledon orbiculata
 * || Dick I., Eastern I., Pigeon I., West Wallabi I. || || || || [[Image:Cotyledon orbiculata 01 Pengo.jpg|100px]]
 * || Dick I., Eastern I., Pigeon I., West Wallabi I. || || || || [[Image:Cotyledon orbiculata 01 Pengo.jpg|100px]]

Cucurbitaceae
! colspan="7" style="text-align:left"|
 * Cucurbita pepo
 * || || Rat I. || || || Zuchinni 1107.JPG
 * || || Rat I. || || || Zuchinni 1107.JPG

Cunoniaceae
! colspan="7" style="text-align:left"|
 * Aphanopetalum clematideum
 * || East Wallabi I. || || || ||
 * || East Wallabi I. || || || ||

Cyperaceae
! colspan="7" style="text-align:left"|
 * Ficinia nodosa
 * Knotted Club Rush || North I. || || || Harvey et al. (2001) listed Isolepis nodosa, but this species has since been transferred into Ficinia. || Ficinia nodosa.jpg
 * - style="background:#CCCCCC;"
 * Isolepis marginata
 * Coarse Clubrush || East Wallabi I., West Wallabi I. || || || Naturalised ||
 * Coarse Clubrush || East Wallabi I., West Wallabi I. || || || Naturalised ||

Dasypogonaceae
! colspan="7" style="text-align:left"|
 * Acanthocarpus preissii
 * || "Eagle Point Islet", East Wallabi I., Little Pigeon I., North I., Oystercatcher I., Pigeon I., Seagull I., Tattler I., West Wallabi I. || || || || Acanthocarpus preissii.jpg
 * || "Eagle Point Islet", East Wallabi I., Little Pigeon I., North I., Oystercatcher I., Pigeon I., Seagull I., Tattler I., West Wallabi I. || || || || Acanthocarpus preissii.jpg

Dilleniaceae
! colspan="7" style="text-align:left"|
 * Hibbertia racemosa
 * Stalked Guinea Flower || East Wallabi I., West Wallabi I. || || || ||
 * Stalked Guinea Flower || East Wallabi I., West Wallabi I. || || || ||

Epacridaceae
! colspan="7" style="text-align:left"|
 * Leucopogon insularis
 * || East Wallabi I., West Wallabi I. || || || ||
 * || East Wallabi I., West Wallabi I. || || || ||

Euphorbiaceae
! colspan="7" style="text-align:left"|
 * Beyeria viscosa
 * Pinkwood || East Wallabi I., Oystercatcher I., West Wallabi I. || || || ||
 * Euphorbia boophthona
 * Gascoyne Spurge || Pigeon I. || || || ||
 * Euphorbia drummondii
 * Caustic Weed || East Wallabi I., West Wallabi I. || Little Rat I., Rat I. || Middle I. || ||
 * Euphorbia tannensis
 * || "Eagle Point Islet", Little Pigeon I., North I., Oystercatcher I., Pigeon I., Seagull I., Turnstone I. || || Middle I. || ||
 * - style="background:#CCCCCC;"
 * Euphorbia terracina
 * Geraldton Carnation Weed || Pigeon I. || Little Rat I., Rat I. || || Naturalised ||
 * Phyllanthus calycinus
 * False Boronia || East Wallabi I., West Wallabi I. || || || ||
 * Euphorbia terracina
 * Geraldton Carnation Weed || Pigeon I. || Little Rat I., Rat I. || || Naturalised ||
 * Phyllanthus calycinus
 * False Boronia || East Wallabi I., West Wallabi I. || || || ||
 * False Boronia || East Wallabi I., West Wallabi I. || || || ||

Frankeniaceae
! colspan="7" style="text-align:left"|
 * Frankenia pauciflora
 * Seaheath || 11 islands || Bushby I., Campbell I., Little Rat I., Rat I. || Davis I., Gun I., Middle I., Murray I., Pelsaert I., Sweet I. || ||
 * Seaheath || 11 islands || Bushby I., Campbell I., Little Rat I., Rat I. || Davis I., Gun I., Middle I., Murray I., Pelsaert I., Sweet I. || ||

Gentianaceae
! colspan="7" style="text-align:left"|
 * - style="background:#CCCCCC;"
 * Centaurium erythraea
 * Common Centaury || || Bushby I., Little Rat I. || || Naturalised || [[Image:Centaurium erythraea 220603.jpg|100px]]
 * - style="background:#CCCCCC;"
 * Schenkia australis
 * || East Wallabi I., North I., Pigeon I., Tattler I., Turnstone I., West Wallabi I. || || Basile I., Gun I., Pelsaert I. || Naturalised. Harvey et al. (2001) lists this as Centaurium spicatum, but this species has been transferred into Schenkia, and the Australian specimens segregated into a new species as S. australis. Harvey et al. (2001) also lists C. maritimum on East Wallabi Island, but this name has been misapplied for C. spicatum in Australia. ||

Geraniaceae
! colspan="7" style="text-align:left"|
 * - style="background:#CCCCCC;"
 * Erodium cicutarium
 * Common Storksbill || Barge Rock, East Wallabi I., Long I., North I., Pigeon I., West Wallabi I. || Little Rat I., Rat I. || Middle I., Pelsaert I., Square I. || Naturalised || [[Image:Erodium cicutarium03.jpg|100px]]
 * Erodium cygnorum
 * Blue Heronsbill || East Wallabi I., North I., Pigeon I. || || || ||
 * Pelargonium littorale
 * || East Wallabi I. || || || ||
 * - style="background:#CCCCCC;"
 * Pelargonium zonale
 * || || Rat I. || || Naturalised. Harvey et al. (2001) lists this species, but FloraBase has no record of it occurring in Western Australia. ||
 * Pelargonium zonale
 * || || Rat I. || || Naturalised. Harvey et al. (2001) lists this species, but FloraBase has no record of it occurring in Western Australia. ||

Goodeniaceae
! colspan="7" style="text-align:left"|
 * Scaevola crassifolia
 * Thick-leaved Fan-flower || East Wallabi I., North I., Seagull I., West Wallabi I. || Campbell I., Rat I., Suomi I. || Pelsaert I. || || Scaevola crassifolia flower close up.jpg
 * Thick-leaved Fan-flower || East Wallabi I., North I., Seagull I., West Wallabi I. || Campbell I., Rat I., Suomi I. || Pelsaert I. || || Scaevola crassifolia flower close up.jpg

Haloragaceae
! colspan="7" style="text-align:left"|
 * Haloragis trigonocarpa
 * || East Wallabi I., Pigeon I. || || || ||
 * || East Wallabi I., Pigeon I. || || || ||

Juncaceae
! colspan="7" style="text-align:left"|
 * - style="background:#CCCCCC;"
 * Juncus bufonius
 * Toad Rush || East Wallabi I., North I., Pigeon I., West Wallabi I. || || || Naturalised || [[Image:Juncus bufonius.jpeg|100px]]

Juncaginaceae
! colspan="7" style="text-align:left"|
 * Triglochin centrocarpa
 * || Dick I., Pigeon I., West Wallabi I. || || Gun I., Middle I., Pelsaert I., Three I. || ||
 * Triglochin mucronata
 * || North I., West Wallabi I. || || || ||
 * Triglochin muelleri
 * || East Wallabi I. || || || ||
 * Triglochin trichophora
 * || Barge Rock, East Wallabi I., North I. || Keru I., Rat I., Serventy I. || || ||
 * || East Wallabi I. || || || ||
 * Triglochin trichophora
 * || Barge Rock, East Wallabi I., North I. || Keru I., Rat I., Serventy I. || || ||
 * || Barge Rock, East Wallabi I., North I. || Keru I., Rat I., Serventy I. || || ||

Lamiaceae
! colspan="7" style="text-align:left"|
 * Westringia dampieri
 * || East Wallabi I., First Sister, West Wallabi I. || || || ||
 * || East Wallabi I., First Sister, West Wallabi I. || || || ||

Liliaceae
! colspan="7" style="text-align:left"|
 * - style="background:#CCCCCC;"
 * Aloe sp.
 * || Little Pigeon I. || || || Naturalised ||

Loganiaceae
! colspan="7" style="text-align:left"|
 * Phyllangium paradoxum
 * || West Wallabi I. || || || ||
 * || West Wallabi I. || || || ||

Malvaceae
! colspan="7" style="text-align:left"|
 * Lavatera sp.
 * || || "Shearwater Islet" || || ||
 * Malva preissiana
 * Australian Hollyhock || 21 islands || 15 islands || 12 islands || Harvey et al. (2001) lists this as Lavatera plebeia, but this is now a synonym of M. preissiana. || [[Image:Malva preissiana.jpg|100px]]
 * - style="background:#CCCCCC;"
 * Malva linnaei
 * Cretan Mallow || || Little North I., White I. || || Naturalised according to FloraBase, though not according to Harvey et al. (2001). The latter source lists this as Lavatera cretica, but this is now a synonym of M. linnaei. || Lavatere de crete.jpg
 * - style="background:#CCCCCC;"
 * Malva parviflora
 * Marshmallow || East Wallabi I., North I., Pigeon I., West Wallabi I. || Rat I. || Newman I., Sid Liddon I. || Naturalised || Malva parviflora small.jpg
 * Sida spodochroma
 * || East Wallabi I. || || || ||
 * Sida spodochroma
 * || East Wallabi I. || || || ||
 * || East Wallabi I. || || || ||

Mimosaceae
! colspan="7" style="text-align:left"|
 * Acacia didyma
 * || East Wallabi I. || || || ||
 * || East Wallabi I. || || || ||

Myoporaceae
! colspan="7" style="text-align:left"|
 * Eremophila glabra
 * Tar Bush || East Wallabi I., West Wallabi I. || || Basile I., Middle I. || || [[Image:Eremophila glabra Murchison Magic.jpg|100px]]
 * Eremophila deserti
 * || East Wallabi I. || || || ||
 * Myoporum insulare
 * Blueberry Tree || 27 islands || 22 islands || 17 islands || || Myoporum insulare.jpg
 * Myoporum insulare
 * Blueberry Tree || 27 islands || 22 islands || 17 islands || || Myoporum insulare.jpg
 * Blueberry Tree || 27 islands || 22 islands || 17 islands || || Myoporum insulare.jpg

Myrtaceae
! colspan="7" style="text-align:left"|
 * Eucalyptus oraria
 * Ooragmandee || East Wallabi I. || || || ||
 * Ooragmandee || East Wallabi I. || || || ||

Onagraceae
! colspan="7" style="text-align:left"|
 * Epilobium billardiereanum
 * Glabrous Willow Herb || East Wallabi I. || || || ||
 * Glabrous Willow Herb || East Wallabi I. || || || ||

Orobanchaceae
! colspan="7" style="text-align:left"|
 * - style="background:#CCCCCC;"
 * Orobanche minor
 * Lesser Broomrape || East Wallabi I. || || || Naturalised || [[Image:Orobanche minor-02 (xndr).jpg|100px]]

Orchidaceae
! colspan="7" style="text-align:left"|
 * Microtis media
 * Tall Mignonette Orchid || East Wallabi I. || || || || [[Image:Microtis media.jpg|100px]]
 * Microtis sp.
 * || East Wallabi I. || || || ||
 * Microtis sp.
 * || East Wallabi I. || || || ||

Oxalidaceae
! colspan="7" style="text-align:left"|
 * - style="background:#CCCCCC;"
 * Oxalis corniculata
 * Yellow Wood Sorrel || East Wallabi I., West Wallabi I. || || || Naturalised || [[Image:Oxalis.corniculata.7562.JPG|100px]]

Papilionaceae
! colspan="7" style="text-align:left"|
 * Bossiaea spinescens
 * || East Wallabi I. || || || ||
 * - style="background:#CCCCCC;"
 * Medicago polymorpha
 * Burr Medic || Little Pigeon I., Pigeon I. || Little Rat I., Rat I., Suomi I. || Pelsaert I. || Naturalised || [[Image:Starr 030405-0074 Medicago polymorpha.jpg|100px]]
 * - style="background:#CCCCCC;"
 * Medicago sp.
 * || || Rat I. || || Naturalised ||
 * - style="background:#CCCCCC;"
 * Melilotus indicus
 * || Beacon I., North I. || Bushby I., Little Rat I., Rat I. || Basile I., Gun I., Pelsaert I., Post Office I. || Naturalised || Melilotus indicus (Flower).jpg
 * Mirbelia ramulosa
 * || East Wallabi I. || || || ||
 * Mirbelia ramulosa
 * || East Wallabi I. || || || ||

Phormiaceae
! colspan="7" style="text-align:left"|
 * Dianella revoluta
 * Blueberry Lily || "Eagle Point Islet", East Wallabi I., Oystercatcher I., Pigeon I., Seagull I., Tattler I., West Wallabi I. || || || ||
 * Blueberry Lily || "Eagle Point Islet", East Wallabi I., Oystercatcher I., Pigeon I., Seagull I., Tattler I., West Wallabi I. || || || ||

Pittosporaceae
! colspan="7" style="text-align:left"|
 * Pittosporum phillyreoides
 * Weeping Pittosporum || 10 islands || || Middle I. || ||
 * Weeping Pittosporum || 10 islands || || Middle I. || ||

Plantaginaceae
! colspan="7" style="text-align:left"|
 * Plantago coronopus
 * Buckshorn Plantain || || Little Rat I. || || || [[Image:Plantago coronopus rosette.jpeg|100px]]
 * Plantago debilis
 * || East Wallabi I., North I., Pigeon I., West Wallabi I. || || Middle I. || ||
 * Plantago debilis
 * || East Wallabi I., North I., Pigeon I., West Wallabi I. || || Middle I. || ||

Plumbaginaceae
! colspan="7" style="text-align:left"|
 * Muellerolimon salicorniaceum
 * || 10 islands || Little Rat I., Rat I. || Middle I. || ||
 * || 10 islands || Little Rat I., Rat I. || Middle I. || ||

Poaceae
! colspan="7" style="text-align:left"|
 * Austrodanthonia caespitosa
 * || East Wallabi I., North I. || || || ||
 * Austrostipa crinita
 * || North I. || || || ||
 * Austrostipa elegantissima
 * || East Wallabi I., Long I., Oystercatcher I., Pigeon I., Seagull I., Turnstone I., West Wallabi I. || || Middle I. || ||
 * Austrostipa flavescens
 * || Akerstrom I., Oystercatcher I., Seagull I., Tattler I. || || || ||
 * Austrostipa variabilis
 * || East Wallabi I., North I., Tattler I., West Wallabi I. || Rat I. || || ||
 * - style="background:#CCCCCC;"
 * Avena barbata
 * Bearded Oat || Little Pigeon I., Pigeon I. || Roma I., Wooded I. || Basile I., Pelsaert I. || Naturalised ||
 * - style="background:#CCCCCC;"
 * Avena fatua
 * Wild Oat || North I. || Alexander I., Little Rat I., Rat I., Serventy I., Suomi I., Wooded I. || Basile I., Burnett Rock, Burton I., Pelsaert I., Uncle Margie I. || Naturalised || [[Image:AvenaFatua.jpg|100px]]
 * - style="background:#CCCCCC;"
 * Avena sp.
 * || Beacon I., Tattler I. || Bushby I. || || Naturalised ||
 * Bromus arenarius
 * Sand Brome || 13 islands || 13 islands || Burnett Rock, Burton I., Coronation I. Newman I., Pelsaert I., Post Office I., Stick I. || || Bromus arenarius HC-1950-1.jpg
 * - style="background:#CCCCCC;"
 * Bromus diandrus
 * Great Brome || Beacon I., Little Pigeon I., Long I., North I., Pigeon I., Seagull I., Turnstone I. || Alexander I., Campbell I., Gilbert I., Leo I., Wooded I. || Basile I., Burton I., Eight I., Three I. || Naturalised || Bromusdiandrus.jpg
 * - style="background:#CCCCCC;"
 * Bromus hordeaceus
 * Soft Brome || 11 islands || || Middle I., Pelsaert I., Square I. || Naturalised || [[Image:Bromus hordeaceus habitus.jpeg|100px]]
 * - style="background:#CCCCCC;"
 * Bromus japonicus var. vestitus
 * || Seal I. || || || Naturalised ||
 * - style="background:#CCCCCC;"
 * Bromus madritensis
 * Madrid Brome || North I. || || || Naturalised ||
 * - style="background:#CCCCCC;"
 * Bromus rubens
 * Red Brome || || || Basile I., Burnett Rock, Uncle Margie I. || Naturalised || Bromus madritensis rubens in desert.jpg
 * - style="background:#CCCCCC;"
 * Bromus sp.
 * || || Campbell I. || Gun I., Murray I., One I., Sweet I. || Naturalised ||
 * - style="background:#CCCCCC;"
 * Cynodon dactylon
 * Couch || East Wallabi I., North I., Pigeon I. || Rat I., Wooded I. || || Naturalised || [[Image:Cynodon dactylon.jpg|100px]]
 * Cynodon sp.
 * || || Rat I. || || ||
 * - style="background:#CCCCCC;"
 * Ehrharta brevifolia
 * Annual Veldt Grass || East Wallabi I. || || Pelsaert I. || Naturalised ||
 * - style="background:#CCCCCC;"
 * Ehrharta longiflora
 * Annual Veldt Grass || Barge Rock, Beacon I., Little Pigeon I., Pigeon I., Seagull I., Tattler I. || 12 islands || Basile Rock, Burton I., Eight I., Gun I., Jackson I., Newman I., Pelsaert I., Uncle Margie I. || Naturalised ||
 * Eragrostis dielsii
 * Mallee Lovegrass || Akerstrom I., East Wallabi I., Little Pigeon I., North I., Pigeon I., Turnstone I. || Little Rat I., Rat I. || Pelsaert I. || ||
 * - style="background:#CCCCCC;"
 * Hordeum murinum subsp. leporinum
 * Barley Grass || Little Pigeon I., North I., Pigeon I. || Alexander Island || Basile I. || Naturalised; in Western Australia this is treated at species rank as Hordeum leporinum. ||
 * Lachnagrostis filiformis
 * Blown Grass || East Wallabi I., West Wallabi I. || || || Harvey et al. (2001) lists this as Agrostis avenacea, but this is now a synonym of L. filiformis. ||
 * Lolium multiflorum
 * Italian Ryegrass || West Wallabi I. || || || Naturalised || [[Image:Westerwolds raaigras Lolium multiflorum.jpg|100px]]
 * - style="background:#CCCCCC;"
 * Lolium perenne
 * Perennial Ryegrass || West Wallabi I. || || Basile I. || Naturalised || [[Image:Lolium perenne Engels raaigras.jpg|100px]]
 * - style="background:#CCCCCC;"
 * Lolium rigidum
 * Wimmera Ryegrass || Alcatraz I., Little Pigeon I. || || Pelsaert I. || Naturalised ||
 * - style="background:#CCCCCC;"
 * Lolium temulentum
 * Drake || || Campbell I., Leo I., Rat I. || Stick I. || Naturalised || [[Image:Illustration Leymus arenarius and Lolium temulentum0.jpg|100px]]
 * - style="background:#CCCCCC;"
 * Parapholis incurva
 * Coast Barbgrass || North I. || Bynoe I., Campbell I., Keru I., Leo I., Morley I., Roma I. || Uncle Margie I. || Naturalised ||
 * - style="background:#CCCCCC;"
 * Pennisetum clandestinum
 * Kikuyu Grass || || Little Rat I. || || Naturalised || [[Image:Starr 020911-0028 Pennisetum clandestinum.jpg|100px]]
 * - style="background:#CCCCCC;"
 * Phalaris canariensis
 * Canary Grass || || || Post Office I. || Naturalised || [[Image:Illustration Phalaris canariensis0.jpg|100px]]
 * - style="background:#CCCCCC;"
 * Phalaris minor
 * Lesser Canary Grass || North I., Pigeon I., East Wallabi I. || Alexander I., Morley I., Serventy I., Suomi I. || Basile I., Burnett Rock, Burton I., Post Office I., Uncle Margie I. || Naturalised ||
 * - style="background:#CCCCCC;"
 * Phleum pratense
 * Timothy || || || "Gun Islet" || Naturalised || [[Image:Phleum pratense001.JPG|100px]]
 * - style="background:#CCCCCC;"
 * Poa annua
 * Winter Grass || Beacon I., East Wallabi I. || || || Naturalised || [[Image:Poa annua.jpg|100px]]
 * Poa poiformis
 * Coastal Poa || East Wallabi I. || || || ||
 * - style="background:#CCCCCC;"
 * Polypogon monspeliensis
 * Annual Beardgrass || Little Pigeon I., Long I., West Wallabi I. || || || Naturalised || Polypogon monspeliensis 3881578658.jpg
 * Polypogon tenellus
 * || East Wallabi I., Pigeon I., West Wallabi I. || || || ||
 * - style="background:#CCCCCC;"
 * Rostraria cristata
 * || Little Pigeon I., North I., Pigeon I. || Bynoe I., Serventy I. || || Naturalised ||
 * Setaria dielsii
 * Diels' Pigeon Grass || 16 islands || 11 islands || Burnett Rock, Burton I., Gun I., Middle I., Newman I., Pelsaert I., Square I., Three I. || ||
 * Setaria sp.
 * || Dick I. || || || ||
 * Spinifex longifolius
 * Beach Spinifex || 15 islands || 13 islands || Burton I., Coronation I., Hummock I., Middle I., Pelsaert I., Post Office I., Stick I., Uncle Margie I. || || [[Image:Spinifex longifolius fg01.JPG|100px]]
 * Sporobolus virginicus
 * Marine Couch || North I., Oystercatcher I., Pigeon I., Seagull I., Turnstone I., West Wallabi I. || || Middle I. || || [[Image:Starr 010202-0207 Sporobolus virginicus.jpg|100px]]
 * - style="background:#CCCCCC;"
 * Triticum aestivum
 * Wheat || North I. || || || Naturalised || [[Image:Wheat close-up.JPG|100px]]
 * - style="background:#CCCCCC;"
 * Vulpia myuros
 * Rat's Tail Fescue || Akerstrom I., East Wallabi I., Little Pigeon I., North I., Pigeon I., Turnstone I., West Wallabi I. || Little Rat I., Rat I., Serventy I. || || Naturalised || [[Image:Vulpia myuros Herbar.jpg|100px]]
 * Diels' Pigeon Grass || 16 islands || 11 islands || Burnett Rock, Burton I., Gun I., Middle I., Newman I., Pelsaert I., Square I., Three I. || ||
 * Setaria sp.
 * || Dick I. || || || ||
 * Spinifex longifolius
 * Beach Spinifex || 15 islands || 13 islands || Burton I., Coronation I., Hummock I., Middle I., Pelsaert I., Post Office I., Stick I., Uncle Margie I. || || [[Image:Spinifex longifolius fg01.JPG|100px]]
 * Sporobolus virginicus
 * Marine Couch || North I., Oystercatcher I., Pigeon I., Seagull I., Turnstone I., West Wallabi I. || || Middle I. || || [[Image:Starr 010202-0207 Sporobolus virginicus.jpg|100px]]
 * - style="background:#CCCCCC;"
 * Triticum aestivum
 * Wheat || North I. || || || Naturalised || [[Image:Wheat close-up.JPG|100px]]
 * - style="background:#CCCCCC;"
 * Vulpia myuros
 * Rat's Tail Fescue || Akerstrom I., East Wallabi I., Little Pigeon I., North I., Pigeon I., Turnstone I., West Wallabi I. || Little Rat I., Rat I., Serventy I. || || Naturalised || [[Image:Vulpia myuros Herbar.jpg|100px]]
 * - style="background:#CCCCCC;"
 * Vulpia myuros
 * Rat's Tail Fescue || Akerstrom I., East Wallabi I., Little Pigeon I., North I., Pigeon I., Turnstone I., West Wallabi I. || Little Rat I., Rat I., Serventy I. || || Naturalised || [[Image:Vulpia myuros Herbar.jpg|100px]]

Polygonaceae
! colspan="7" style="text-align:left"|
 * - style="background:#CCCCCC;"
 * Emex australis
 * Doublegee || Little Pigeon I., Pigeon I. || Rat I. || || Naturalised || Emexaustralis.jpg

Portulacaceae
! colspan="7" style="text-align:left"|
 * Calandrinia calyptrata
 * Pink Purslane || North I. || || Rotondella I., Uncle Margie I. || ||
 * Pink Purslane || North I. || || Rotondella I., Uncle Margie I. || ||

Primulaceae
! colspan="7" style="text-align:left"|
 * - style="background:#CCCCCC;"
 * Anagallis arvensis
 * Pimpernel || Pigeon I., West Wallabi I. || Alexander I., Bushby I., Little Rat I., Rat I., Serventy I. || Gun I., Middle I., Pelsaert I. || Naturalised || [[Image:Scarlet pimpernel 800.jpg|100px]]

Proteaceae
! colspan="7" style="text-align:left"|
 * Grevillea argyrophylla
 * Silvery-leaved Grevillea || East Wallabi I., North I., Pelican I., Saville-Kent I., West Wallabi I. || || Basile I., Middle I., Murray I. || ||
 * Silvery-leaved Grevillea || East Wallabi I., North I., Pelican I., Saville-Kent I., West Wallabi I. || || Basile I., Middle I., Murray I. || ||

Ranunculaceae
! colspan="7" style="text-align:left"|
 * Ranunculus sessiliflorus
 * Smallflower Buttercup || East Wallabi I. || || || ||
 * Smallflower Buttercup || East Wallabi I. || || || ||

Rhamnaceae
! colspan="7" style="text-align:left"|
 * Spyridium globulosum
 * Basket Bush || East Wallabi I., North I., West Wallabi I. || || || ||
 * Basket Bush || East Wallabi I., North I., West Wallabi I. || || || ||

Rubiaceae
! colspan="7" style="text-align:left"|
 * Galium sp.
 * || East Wallabi I. || || || Harvey et al. (2001) list this as "Galium migrans" but, according to FloraBase, that species is not present in Western Australia. ||
 * Opercularia vaginata
 * Dog Weed || East Wallabi I. || || || ||
 * Opercularia vaginata
 * Dog Weed || East Wallabi I. || || || ||

Rutaceae
! colspan="7" style="text-align:left"|
 * Diplolaena grandiflora
 * Wild Rose || "Eagle Point Islet", East Wallabi I., Little Pigeon I., Oystercatcher I., Pigeon I., Seagull I., Tattler I., Turnstone I., West Wallabi I. || Little Rat I., Rat I. || Gun I. || || [[Image:Diplolaena grandiflora.jpg|100px]]
 * Wild Rose || "Eagle Point Islet", East Wallabi I., Little Pigeon I., Oystercatcher I., Pigeon I., Seagull I., Tattler I., Turnstone I., West Wallabi I. || Little Rat I., Rat I. || Gun I. || || [[Image:Diplolaena grandiflora.jpg|100px]]

Santalaceae
! colspan="7" style="text-align:left"|
 * Exocarpos aphyllus
 * Leafless Ballart || East Wallabi I., Little Pigeon I., Long I., Oystercatcher I., Pigeon I., Seagull I., Tattler I., West Wallabi I. || || || ||
 * Exocarpos sparteus
 * Broom Ballart || North I., West Wallabi I. || || || ||
 * Exocarpos sparteus
 * Broom Ballart || North I., West Wallabi I. || || || ||

Sapindaceae
! colspan="7" style="text-align:left"|
 * Dodonaea aptera
 * Coast Hop-bush || East Wallabi I., North I., Oystercatcher I., West Wallabi I. || || || ||
 * Dodonaea inaequifolia
 * || East Wallabi I., Oystercatcher I., West Wallabi I.|| || || ||
 * Dodonaea viscosa
 * Sticky Hopbush || Seagull I. || || || || [[Image:Dodonea viscosa flowers1.JPG|100px]]
 * Dodonaea viscosa
 * Sticky Hopbush || Seagull I. || || || || [[Image:Dodonea viscosa flowers1.JPG|100px]]
 * Sticky Hopbush || Seagull I. || || || || [[Image:Dodonea viscosa flowers1.JPG|100px]]

Scrophulariaceae
! colspan="7" style="text-align:left"|
 * - style="background:#CCCCCC;"
 * Dischisma arenarium
 * || West Wallabi I. || || || Naturalised ||

Solanaceae
! colspan="7" style="text-align:left"|
 * - style="background:#CCCCCC;"
 * Lycium ferocissimum
 * African Boxthorn || || Wooded I. || Arthur I., Davis I., Eight I., Gun I., Pelsaert I., Seven I., Sid Liddon I., Sweet I., Three I. || Naturalised. This has been declared a noxious weed, and an eradication program is in place. Harvey et al. (2001) record the plant on only these ten islands, but in 2007 the Department of Environment and Conservation reported that it had been eradicated from 14 out of 18 islands on which it had previously occurred. || [[Image:African boxthorn fruit.jpg|100px]]
 * - style="background:#CCCCCC;"
 * Lycopersicon esculentum
 * Tomato || || Rat I., Roma I. || Jackson I., Middle I. || Naturalised || [[Image:Tomato scanned.jpg|100px]]
 * - style="background:#CCCCCC;"
 * Nicotiana glauca
 * Tree Tobacco || Pigeon I. || || || Naturalised || [[Image:Nicotiana glauca.jpg|100px]]
 * Nicotiana occidentalis subsp. hesperis
 * Native Tobacco || 14 islands || Alexander I., Morley I., White I., Wooded I. || Middle I., Pelsaert I. || ||
 * - style="background:#CCCCCC;"
 * Solanum laciniatum
 * Kangaroo Apple || East Wallabi I. || || || Naturalised || [[Image:2007 solanum laciniatum.jpg|100px]]
 * - style="background:#CCCCCC;"
 * Solanum nigrum
 * Black Berry Nightshade || Beacon I., East Wallabi I., Little Pigeon I., Pigeon I., West Wallabi I. || Bushby I., Little Rat I., Rat I., Roma I. || Eight I., Gun I. || Naturalised || [[Image:Solanum nigrum.jpg|100px]]
 * Solanum symonii
 * || Alcatraz I., Beacon I., East Wallabi I., Oystercatcher I., Seagull I. || || || ||
 * Solanum symonii
 * || Alcatraz I., Beacon I., East Wallabi I., Oystercatcher I., Seagull I. || || || ||

Sterculiaceae
! colspan="7" style="text-align:left"|
 * Lasiopetalum angustifolium
 * Narrow Leaved Lasiopetalum || East Wallabi I. || || || ||
 * Narrow Leaved Lasiopetalum || East Wallabi I. || || || ||

Tamaricaceae
! colspan="7" style="text-align:left"|
 * - style="background:#CCCCCC;"
 * Tamarix aphylla
 * Athel Tree || Pigeon I., West Wallabi I. || || || Naturalised. Harvey et al. (2001) list this as "Tamarix sp.", but T. aphylla is the only Tamarix species naturalised in Western Australia. || [[Image:Starr 030923-0205 Tamarix aphylla.jpg|100px]]

Thymelaeaceae
! colspan="7" style="text-align:left"|
 * Pimelea microcephala
 * Shrubby Riceflower || 11 islands || || || ||
 * Shrubby Riceflower || 11 islands || || || ||

Urticaceae
! colspan="7" style="text-align:left"|
 * Parietaria cardiostegia
 * || Dakin I., Saville-Kent I. || Bynoe I., Keru I. || Burton I. || ||
 * Parietaria debilis
 * Pellitory || Beacon I., Dakin I., Dick I., Eastern I., East Wallabi I., Long I., North I., Saville-Kent I., West Wallabi I. || Alexander I., Bynoe I., Keru I., Leo I., Little North I., Morley I., Rat I., White I. || 13 islands || ||
 * - style="background:#CCCCCC;"
 * Urtica urens
 * Small Nettle || East Wallabi I., West Wallabi I. || || || Naturalised || [[Image:Urtica urens-1.jpg|100px]]
 * Urtica urens
 * Small Nettle || East Wallabi I., West Wallabi I. || || || Naturalised || [[Image:Urtica urens-1.jpg|100px]]

Zygophyllaceae

 * Nitraria billardierei
 * Nitre Bush || 43 islands || 30 islands || 34 islands || This is the most widespread plant species in the Houtman Abrolhos. || [[Image:Nitraria billardierei.jpg|100px]]
 * Zygophyllum simile
 * || Beacon I., Dakin I., Dick I., East Wallabi I., Long I., North I., Saville-Kent I., West Wallabi I. || || || ||
 * }
 * || Beacon I., Dakin I., Dick I., East Wallabi I., Long I., North I., Saville-Kent I., West Wallabi I. || || || ||
 * }