Leionema ralstonii, is a small shrub with angular, smooth branchlets and pale green flowers in winter.

Leionema ralstonii is a small shrub to about 1 m (3 ft 3 in) high with smooth, substantially angular branchlets.

The smooth leaves are more or less lance shaped, broader at the apex, 2.5–5 cm (0.98–1.97 in) long, 5–8 mm (0.20–0.31 in) wide, gradually narrowing at the base, margins rolled under or upward when dry.

[2][3] This species was first formally described by Ferdinand von Mueller in 1860 and he gave it the name Eriostemon ralstonii and description was published in Fragmenta Phytographiae Australiae.

[2] This species is classified as "vulnerable" by the Government of New South Wales Environment Protection and Biodiversity Conservation Act 1999.