Cyanothamnus montimulliganensis

Cyanothamnus montimulliganensis is a plant in the citrus family Rutaceae and is endemic to a single mountain in Queensland. It is an erect, woody shrub with pinnate or bipinnate leaves and white, four-petalled flowers usually arranged singly in leaf axils.

Description
Cyanothamnus montimulliganensis is an erect, woody shrub that grows to a height of at least 35 cm tall. The branches are slightly hairy but covered with pimply glands. The leaves are pinnate or bipinnate with between three and seven leaflets and 20-40 mm long and 30-34 mm wide in outline on a petiole 7-12 mm long. The end leaflet is linear, 5-15 mm long and about 1 mm wide and the same colour on both surfaces. The side leaflets are similar to the end leaflet but longer. The flowers are white and are usually arranged singly, sometimes in groups of up to three, in leaf axils, on a pedicel about 1 mm long. The four sepals are circular, about 1 mm long and wide and glabrous. The four petals are 2-2.5 mm long and glabrous. The eight stamens are hairy. Flowering has been observed in April and June, and the fruit is a glabrous capsule about 3.5 mm long and 1.75 mm wide.

Taxonomy and naming
This species was first formally described in 2003 by Marco F. Duretto who gave it the name Boronia montimulliganensis in the journal  Muelleria. The specific epithet (montimulliganensis) refers to the isolated Mount Mulligan, the only place where this species is known to occur. In a 2013 paper in the journal Taxon, Marco Duretto and others changed the name to Cyanothamnus montimulliganensis on the basis of cladistic analysis.

Distribution and habitat
Cyanothamnus montimulliganensis grows in woodland on sandstone on Mount Mulligan in north Queensland.

Conservation
Cyanothamnus montimulliganensis (as Boronia montimulliganensis) is listed as of "least concern" under the Queensland Government Nature Conservation Act 1992.