It is a low, dense, compact shrub with broadly heart-shaped to egg-shaped or more or less round leaves and pink to purple flowers.

[2][3][4] This species was first formally described in 1852 by Nicolai Stepanovitch Turczaninow who gave it the name Asterochiton pygmaeus in Bulletin de la Société Impériale des Naturalistes de Moscou from specimens collected by James Drummond.

[5][6] In 1863, George Bentham changed the name to Thomasia pygmaea in Flora Australiensis.

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

[9] Tiny thomasia is described as an attractive small shrub, useful for edging, container growing or in rockeries.