Lasiopetalum solanaceum Sims Thomasia solanacea is a species of flowering plant in the family Malvaceae and is endemic to the south-west of Western Australia.

It is an erect, bushy shrub with egg-shaped leaves, the bases heart-shaped, and racemes of white, cream-coloured or pink to purple flowers.

[4][5] In 1821, Jaques Étienne Gay transferred the species to the genus Thomasia in the journal Mémoires du Muséum d'Histoire Naturelle.

[7] Thomasia solanacea usually grows as an undershrub in woodland and occurs between Denmark, the Stirling Range and Mount Manypeaks in the Esperance Plains, Jarrah Forest and Warren bioregions of south-western Western Australia.

[2][3] Thomasia solanacea is listed as "Priority Four" by the Government of Western Australia Department of Biodiversity, Conservation and Attractions,[3] meaning that it is rare or near threatened.