Renascent perennial herbs. Rootstock a corm with papery scales; roots fleshy to tuberous. Leaves annual, few, linear, mostly basal. Scape simple (mostly) or branched. Inflorescence a terminal bracteate umbel. Flowers bisexual, pedicellate; tepals in one whorl, free, equal, convolute around adjacent stamens in bud; stamens 6, attached to base of tepals, filaments filiform, anthers dorsifixed, dehiscing longitudinally by slits; ovary superior, trigonous, 3-locular, ovules numerous per locule; style 3-branched. Fruit a septicidal capsule; seeds irregular, angular, brown.
5 species, endemic to Australia, all but the widespread B. umbellata confined to Western Australia.