Thysanotus isantherus

Thysanotus isantherus is a tufted, slender, perennial herb with elliptical tubers about 8 mm (0.31 in) long 4 mm (0.16 in) wide 10–15 mm (0.39–0.59 in) from the small rootstock. About six threadlike leaves 100–150 mm (3.9–5.9 in) long are produced each year. One or two flowers are borne in up to five umbels on pedicels 8–10 mm (0.31–0.39 in) long. The flowers are purple, the perianth segments about 7 mm (0.28 in) long. The sepals are lance-shaped, about 2 mm (0.079 in) wide and the petals are broadly elliptic, about 5 mm (0.20 in) wide with a fringe 1.0–1.5 mm (0.039–0.059 in) long. There are six stamens, the anthers 2.5–3 mm (0.098–0.118 in) long and the style is about 3 mm (0.12 in) long. Flowering occurs in November and December and the seeds are spherical, about 1.5 mm (0.059 in) in diameter with a pale straw-coloured aril.

This species of Thysanotus grows in moss swards on granite hills in the Jarrah Forest and Warren bioregions of south-western Western Australia.