Thysanotus triandrus

Thysanotus triandrus is a tufted perennial herb with a small rootstock and fibrous roots. It has about 5 to 42 narrowly lance-shaped to more or less linear and flat or channelled leaves that are more or less terete on the upper surface and ridged below, 50–430 mm (2.0–16.9 in) long and 1.5–3 mm (0.059–0.118 in) wide. The flowers are borne in an umbel with four to fifty flowers, each on a pedicel 5–35 mm (0.20–1.38 in) long. The perianth segments are 9–15 mm (0.35–0.59 in) long, the sepals lance-shaped, about 3 mm (0.12 in) wide, and the petals elliptic, 6–7 mm (0.24–0.28 in) wide, with a fringe about 3 mm (0.12 in) long. There are three stamens, the anthers about 5 mm (0.20 in) long, slightly curved and twisted, the style curved, about 6 mm (0.24 in) long. Flowering occurs from September to December, and the seeds are cylindrical about 2 mm (0.079 in) long and 1 mm (0.039 in) in diameter with a stalked, yellow aril.

Thysanotus triandrus grows in low Banksia forest on inland sandplain vegetation in deep white sand, sometimes with Eucalyptus staeri in dark, humus-rich sand. It occurs from Cockleshell Gully to Esperance and Israelite Bay, in the Avon Wheatbelt, Esperance Plains, Geraldton Sandplains, Jarrah Forest, Mallee, Swan Coastal Plain and Warren bioregions of south-western Western Australia.