It is a slender, spreading shrub with lax, hairy young branches, leaves with the edges rolled under, and white flowers.

The flowers are bell-shaped with five divided, petal-like sepals 11–13 mm (0.43–0.51 in) long, that are white on the outside, pale green inside.

[2][3][4] Guichenotia alba was first formally described in 1992 by Greg Keighery and the description was published in the journal Nuytsia from specimens he collected near Cataby in 1988.

[6] This species of Guichenotia grows in heath, often in winter-wet areas, in a few places between Three Springs and Cataby in the Avon Wheatbelt, Geraldton Sandplains and Swan Coastal Plain bioregions of south-western Western Australia.

[2][3][4] Guichenotia alba is listed as "Priority Three" by the Government of Western Australia Department of Biodiversity, Conservation and Attractions,[4] meaning that it is poorly known and known from only a few locations but is not under imminent threat.