Tufted or stilt-rooted rhizomatous perennial herbs. Roots wiry and often aerial. Leaves cauline, linear, terete or triquetrous, with sheathing base. Inflorescence a pedunculate to sessile, terminal, head-like umbel, surrounded by an involucre of scarious bracts. Flowers shortly pedicellate, bisexual; sepals free; petals free or partly fused; stamens 6, slightly shorter than petals, inner 3 largely fused to petals, filaments filiform, anthers dorsifixed; ovary superior, 3-locular with 1–8 ovules per locule; style filiform, stigma dilated. Fruit a capsule surrounded by the persistent perianth; seeds 3–12, triangular, black, papillate.
13 species, endemic in Australia, predominantly in Western Australia, 2 in Victoria.