Herbs annual, densely covered throughout with stellate hairs. Stem erect, dichasially branched from base to apex. Leaves alternate, sessile, flattened, linear-lanceolate to acicular, base attenuate, margin entire, apex acuminate; midvein prominent. Flowers unisexual (plants monoecious). Male flowers sessile or shortly pedicellate, usually 2 or 3 borne together on a short peduncle in leaf axils and forks of upper branches; bracts and bractlets absent; perianth tubular, 2-lobed, membranous; stamen 1, included, but slightly exserted at anthesis. Female flowers axillary, solitary; bractlets 2, united into a narrowly obovoid to trigonous tube, compressed, with an acicular appendage at apex of each side, densely stellate pubescent; perianth absent; ovary globose, hairy; style short; stigmas 2. Utricle obovoid or conic, compressed, midline prominent, densely stellate hairy, acicular appendages stiff, straight or slightly curved, apex truncate or concave. Seed vertical, brown, of same shape as utricle; embryo semi-annular; radicle inferior; perisperm scant.
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