Marianthus tenuis

Marianthus tenuis is slender, twining shrub with silky-hairy new shoots. Its adult leaves are narrowly elliptic and clustered, 15–34 mm (0.59–1.34 in) long and 4–7 mm (0.16–0.28 in) wide. The flowers are borne in small groups on a peduncle 12–15 mm (0.47–0.59 in) long, each flower on a pedicel less than 5 mm (0.20 in) long. The sepals are silky-hairy and about 4 mm (0.16 in) long. The five petals are white with a mauve tinge, 10–12 mm (0.39–0.47 in) long and about 2.7 mm (0.11 in) wide. Three of the petals develop darker spots as they age. Flowering occurs in November or from January to June with a peak from March to April. The fruit is an elliptic capsule 8–9 mm (0.31–0.35 in) long and about 5 mm (0.20 in) in diameter.

Marianthus tenuis grows in open coastal heath on limestone and in woodland on laterite south from the Darling Range in the Avon Wheatbelt, Jarrah Forest, Swan Coastal Plain and Warren bioregions of south-western Western Australia.