Guichenotia asteriskos is a flowering plant in the family Malvaceae and is endemic to the southwest of Western Australia. It is a dwarf, spreading shrub with hairy new growth, linear to narrowly egg-shaped leaves, and white flowers.
Guichenotia asteriskos is a dwarf, spreading shrub that typically grows to high and wide, its new growth covered with white, star-shaped hairs. The leaves are linear to narrowly egg-shaped, long and about wide on a petiole long and lacking stipules. The edges of the leaves are rolled under, both surfaces of the leaves are densely covered with star-shaped hairs, the upper surface becoming glabrous. The flowers are borne singly in upper leaf axils on a peduncle long, each flower on a pedicel long, with bracts long and tiny, triangular bracteoles at the base. There are five petal-like sepals long divided for three-quarters of their length, and there are tiny, dark red petals but no staminodes. Flowering occurs in September and October and the fruit is an elliptic capsule about long.[1]
Guichenotia asteriskos was first formally described in 2003 by Carolyn F. Wilkins in Australian Systematic Botany from specimens she collected near Newdegate in 1995.[2] The specific epithet (asteriskos) means "small star", referring to shape of the flowers when they first open.[3]
This species of guichenotia grows as an understorey plant in shrubland in the Avon Wheatbelt, Mallee and Esperance Plains bioregions of south-western Western Australia.[1]
Guichenotia asteriskos is listed as "Priority Two" by the Western Australian Government Department of Biodiversity, Conservation and Attractions, meaning that it is poorly known and from only one or a few locations.[4]