Thomasia × formosa

Thomasia × formosa is an erect, compact shrub that typically grows to 0.5–0.7 m (1 ft 8 in – 2 ft 4 in) high, 0.5–1 m (1 ft 8 in – 3 ft 3 in) wide and has its branchlets densely covered with rust-coloured, star-shaped hairs. The leaves are egg-shaped to elliptic or oblong, 20–40 mm (0.79–1.57 in) long and 4–10 mm (0.16–0.39 in) wide, tapering to a petiole 3–5 mm (0.12–0.20 in) long with oval stipules 4–7 mm (0.16–0.28 in) long at the base. The upper surface of the leaves is wrinkled, the edges have rounded teeth and down-curved edges, and both surfaces are covered with rust-coloured, star-shaped hairs. The flowers are arranged in racemes of 7 or more in leaf axils on a peduncle 30–40 mm (1.2–1.6 in) long, each flower on a pedicel up to 10 mm (0.39 in) long, with egg-shaped bracts and 3 bracteoles about 7 mm (0.28 in) long at the base. The sepals are pink or purple with lobes 10 mm (0.39 in) long. Flowering occurs in September and October.[2][3][4]

Thomasia × formosa was first formally described in 1974 by Susan Paust in the journal Nuytsia, from specimens collected by Charles Chapman near Three Springs in 1972.[5] The specific epithet (formosa) means "handsome".[2]

This species is an inter-generic hybrid between Thomasia macrocalyx and Lysiosepalum rugosum.[1][6]

This thomasia grows in mallee woodland, shrubland and heath in a restricted area near Three Springs in the Avon Wheatbelt and Geraldton Sandplains bioregions of south-western Western Australia.[3][4]

Thomasia × formosa is listed as "Threatened" by the Western Australian Government Department of Biodiversity, Conservation and Attractions,[4] meaning that it is in danger of extinction.[7]