Thryptomene johnsonii

Thryptomene johnsonii is a bushy shrub that typically grows to a height of up to 2 m (6 ft 7 in) and has rigid branches. Its leaves are mostly egg-shaped with the narrower end towards the base, 1.7–3.4 mm (0.067–0.134 in) long and about 1.5 mm (0.059 in) wide on a petiole 0.4–0.5 mm (0.016–0.020 in) long. The flowers are usually arranged singly in leaf axils in pairs of up to four near the ends of branchlets, each flower on a peduncle 0.4–0.7 mm (0.016–0.028 in) long with egg-shaped bracteoles 1.5–2 mm (0.059–0.079 in) long. The flowers are 6–7 mm (0.24–0.28 in) in diameter with five broadly egg-shaped sepals and five more or less round, pink petals about 2.5 mm (0.098 in) long. There are usually eight, irregularly arranged stamens. Flowering has been observed in October.[2][3]

Thryptomene johnsonii was first formally described in 1864 by Ferdinand von Mueller in Fragmenta phytographiae Australiae from specimens collected near the Murchison River.[4][5] The specific epithet (johnsonii) honours William Johnson (1825–1887) who studied the medicinal properties of the Myrtaceae.[6]

This thryptomene grows in sand on a sandplain slope in the Kalbarri National Park.[2][3]

Thryptomene johnsonii is classified as "Priority Two" by the Western Australian Government Department of Parks and Wildlife[2] meaning that it is poorly known and from only one or a few locations.[7]