Sannantha crenulata

Sannantha crenulata, commonly known as fern-leaf baeckea, is a species of flowering plant in the myrtle family, Myrtaceae and is endemic to a restricted part of Victoria in Australia. It is an erect shrub with egg-shaped to round leaves with scalloped edges, and groups of usually 3 white flowers arranged in leaf axils.

Description
Sannantha crenulata is an erect shrub that typically grows to a height of 1–3 m. Its leaves are egg-shaped to round, 3–7 mm long and 2–5 mm wide on a petiole 0.6–0.9 mm long. The edges of the leaves are minutely scalloped. The flowers are up to 8 mm in diameter and arranged in leaf axils, usually in groups of 3 on a peduncle 4–10.5 mm long. Each flower is on a pedicel 5.3–8.5 mm long with many bracteoles at the base, but that fall off as the flowers develop. The floral tube is 1.6–1.9 mm long, the sepal lobes 0.6–0.9 mm long and thin. The petals are white, 3.0–3.5 mm long and wide and there are 12 to 14 stamens. Flowering has been observed from November to March and the fruit is a hemispherical capsule 2–3 mm in diameter.

Taxonomy
This species was first formally described in 1855 by Ferdinand von Mueller who gave it the name Camphoromyrtus crenulata in his book Definitions of rare or hitherto undescribed Australian plants from specimens collected on "springs and rivulets of the Buffalo Ranges". In 2007, Peter Gordon Wilson transferred the species to Sannantha as S. crenulata in Australian Systematic Botany. The specific epithet (crenulata) means "crenulate".

Distribution and habitat
Fern-leaf baeckea is only known from the lower parts of Mount Buffalo in north-eastern Victoria, where it grows on rocky streamsides in open forest and scrub.

Conservation status
Sannantha crenulata is listed as "vulnerable" under the Australian Government Environment Protection and Biodiversity Conservation Act 1999 and as "endangered" under the Victorian Government Flora and Fauna Guarantee Act 1988. The main threats to the species include weed invasion, inappropriate fire regimes, and road works.