Annual or short-lived perennial, decumbent to erect subshrubs, pilose to silky pubescent. Leaves alternate, sessile, ± linear, subterete. Flowers bisexual, solitary in leaf axils; perianth cylindrical, 5-lobed; stamens 5; stigmas 2. Fruiting perianth hardened, with 5 erect spine-like appendages that are ± united into an apical cup; pericarp membranous; seed vertical; testa membranous.
An endemic Australian genus of 2 species.
