Marianthus dryandra is an erect, scrambling shrub that typically grows to a height of up to 40 cm (16 in) and has densely hairy new shoots.

The flowers are borne singly on short side shoots on a peduncle less than 10 mm (0.39 in) long.

The five petals are 6–10 mm (0.24–0.39 in) long and cream-coloured with maroon spots along the veins.

[4] The specific epithet (dryandra) refers to the type location, the only known habitat of this species.

[3][2] Marianthus dryandra is listed as "Priority Two" by the Western Australian Government Department of Biodiversity, Conservation and Attractions,[2] meaning that it is poorly known and from only one or a few locations.