Thysanotus acerosifolius

Thysanotus acerosifolius is a tufted, perennial herb with a rootstock 5–15 mm (0.20–0.59 in) in diameter enclosed by bracts and leaf bases of previous years' growth. The roots are fibrous expanded into yellowish tubers. Ten to fifteen glabrous, thread-like leaves 90–240 mm (3.5–9.4 in) are produced each season. The flowers are borne in panicles 150–300 mm (5.9–11.8 in) tall, usually only branching in the top 20 mm (0.79 in). Each umbel has 3 or 4 flowers, each on a pedicel 6–7 mm (0.24–0.28 in) long. The scape is erect, circular in cross section, and the flowers are purple, the outer tepals linear, 10 mm (0.39 in) long and 1.5 mm (0.059 in) wide and the inner tepals egg-shaped with a fringe 2–3 mm (0.079–0.118 in) wide. There are six stamens and the ovary is sessile with three locules, each with two ovules. This species resembles T. brevifolius but differs in its shorter, narrower leaves and accumulation of past season's leaf bases.

This species grows between Lake Grace and Lake Pallarup on sandplains in sand, laterite, and clay-loam in the Avon Wheatbelt and Yalgoo bioregions of south-western Western Australia.