It is a dwarf, spreading shrub with hairy new growth, linear to narrowly egg-shaped leaves, and pink flowers.

[2][3] Guichenotia astropletha was first formally described in 2003 by Carolyn F. Wilkins in Australian Systematic Botany from specimens collected near the Marchagee Track in 1995.

[4] The specific epithet (astropletha) means "a starry cloud", referring to the white, star-shaped hairs on the ovary.

[2][5] This species of guichenotia grows as an understorey plant in a variety of habitats from heath to woodland between Merredin and Three Springs in the Avon Wheatbelt and Geraldton Sandplains bioregions of south-western Western Australia.

[2][3] Guichenotia astropletha is listed as "not threatened" by the Western Australian Government Department of Biodiversity, Conservation and Attractions.