It is a slender, semi-woody, annual shrub with narrowly elliptic or linear leaves and densely hairy, white or yellow flowers and green, purple-tinged fruit.

Pimelea trichostachya is a slender, erect, sem-woody annual shrub that typically grows to a height of up to 75 cm (30 in) and has hairy stems.

Flowering occurs in most months with a peak from August to December and the fruit is green with a purplish tinge and about 3 mm (0.12 in) long.

[2][4][5][6][7][8] Pimelea trichostachya was first formally described in 1848 by John Lindley in Thomas Mitchell's Journal of an Expedition into the Interior of Tropical Australia.

[11] Annual rice-flower mainly grows in deep sand im mallee and occurs in all mainland states and the Northern Territory, but is absent from most of the north of the country, from the east and west coasts and from most of Victoria.