Thysanotus scaber is a species of flowering plant in the Asparagaceae family, and is endemic to the south-west of Western Australia. It is a perennial herb with a small rootstock, cylindrical tubers, about four to six channnelled leaves and umbels of four to eight purple flowers with linear sepals, elliptic, fringed petals and six stamens.
Thysanotus scaber is a perennial herb with a small rootstock surrounded by old leaf bases. Its roots are tuberous, the tubers cylindrical about long. About four to six leaves are produced annually, channelled and ridged, long and rough with short teeth. The flowers are borne in panicles long with four to eight umbels, each flower on a pedical long. The perianth segments are long, the sepals linear, about wide and the petals are purple, about wide with a fringe about wide. There are six stamens, the anthers are about long and the style about long. Flowering occurs in October and November, and the fruit is more or less spherical, in diameter with a pale, straw-coloured aril.
Thysanotus scaber was first formally described in 1846 by Stephan Endlicher in Lehmann's Plantae Preissianae from specimens collected near the Swan River.
This species of Thysanotus grows in jarrah-marri (Eucalyptus marginata - E. calophylla) forest or in marri-wandoo (E. calophylla - E. wandoo) forest,on the Darling Range from near Perth, east to York then to about south-south-east of Perth, in the Avon Wheatbelt, Jarrah Forest and Swan Coastal Plain bioregions of south-western Western Australia.
Thysanotus scaber is listed as "not threatened" by the Western Australian Government Department of Biodiversity, Conservation and Attractions.