Dampiera juncea is an upright perennial to 60 cm (24 in) high, becoming smooth except the flowers and the stems are slightly ribbed.

The leaves are sessile, linear to needle-shaped to lance-shaped, dense, smooth or covered in occasional soft hairs, 3–50 mm (0.12–1.97 in) long and 1–20 mm (0.039–0.787 in) wide.

Flowering occurs mostly from August to November and the fruit is cylinder-shaped and up to 7 mm (0.28 in) long.

[2][3] Dampiera juncea was first formally described in 1868 by George Bentham and the description was published in Flora Australiensis.

[6] Rush-like dampiera grows inland on sandy, clay or gravelly soils in south-western Western Australia.