Thysanotus teretifolius is a species of flowering plant in the Asparagaceae family, and is endemic to the south-west of Western Australia. It is a tufted perennial herb with a small rootstock, fibrous roots, up to ten linear, perennial linear leaves and umbels of ten to fifteen purple flowers with narrowly lance-shaped sepals, elliptic fringed petals and three stamens with equal anthers.
Description Thysanotus teretifolius is a tufted perennial herb with a small rootstock and fibrous roots. It has up to ten perennial linear, terete, more or less striated leaves up to long and wide. The flowers are borne in an umbel with ten to fifteen flowers on a pedicel long. The perianth segments are long, the sepals narrowly lance-shaped, about wide, and the petals elliptic, wide, with a fringe about long. There are three stamens, the anthers about long and curved, the style curved and bent sideways, about long. Flowering occurs from September to November.
Taxonomy Thysanotus teretifolius was first formally described in 1972 by Norman Henry Brittan in the Journal of the Royal Society of Western Australia from specimens collected he collected about north of Eneabba in 1968. The specific epithet (teretifolius) means 'terete-leaved'.
Distribution and habitat This species of Thysanotus grows in sandplain vegetation in mallee eucalypts, usually in deep sandy soils, from near Northampton to near Mount Lesueur and south-east to Wongan Hills, in the Avon Wheatbelt, Geraldton Sandplains and Swan Coastal Plain bioregions of south-western Western Australia.
Conservation status Thysanotus teretifolius is listed as "not threatened" by the Western Australian Government Department of Biodiversity, Conservation and Attractions.
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