Grevillea costata

Grevillea costata is a spreading shrub that typically grows to a height of 0.8–1.5 m (2 ft 7 in – 4 ft 11 in) and has many ridged, silky-hairy branchlets. Its leaves are linear, 15–45 mm (0.59–1.77 in) long and 0.8–1.3 mm (0.031–0.051 in) wide with the edges rolled under, enclosing all but the mid-vein. The flowers are arranged in groups of four to ten in leaf axils or on the ends of branchlets and are white, the pistil 7.0–9.5 mm (0.28–0.37 in) long with a white to cream-coloured, sometimes pink style. Flowering occurs from May to September and the fruit is an elliptic to oblong follicle 9.5–11 mm (0.37–0.43 in) long with prominent ridges.[2][3][4]

Grevillea costata was first formally described in 1974 by Alex George in the journal Nuytsia from specimens collected by Charles Gardner near rocks in the Murchison River in 1931.[4][5] The specific epithet (costata) means "ribbed", referring to the fruit.[4][6]

This grevillea grows in sand and among rocks in the river bed of the Murchison River in the Carnarvon, Geraldton Sandplains and Yalgoo biogeographic region of Western Australia.[2][3]

Grevillea costata is listed as "Priority Three" by the Government of Western Australia Department of Biodiversity, Conservation and Attractions,[3] meaning that it is poorly known and known from only a few locations but is not under imminent threat.[7]

• List of Grevillea species