Description: Annual herbs; stiffly hairy.
Leaves opposite, basal leaves subsessile with a short sheath, upper leaves becoming sessile.
Inflorescence terminal, open scorpioid cymes, bracteate; flowers pedicellate. Sepals fused only at the base. Corolla actinomorphic, cylindrical with papillose scales in the throat. Stamens inserted just below the throat; anthers subsessile, appendages short and acute. Ovary 4-lobed; style short; stigma capitate.
Fruit of 4 prickly mericarps splitting from a slender, conical gynobase.
Distribution and occurrence: World: 1 species, endemic Australia. Australia: 1 species, endemic.
Text by Peter G. Wilson