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Erect or procumbent annual or short-lived perennial, up to ± 900 mm tall, irregularly branched. Leaves alternate or in clusters, linear or lanceolate, ± glaucous. Flowers in a diffuse branching cyme, subsessile, green with a broad white border. Mericarp disclike, with tubercles radiating from centre, wingless or surrounded by a transparent, radiately nerved wing.
Mericarps compressed-orbicular, longer than perianth-segments, puberulous, dorsally tuberculate, the tubercles radiating from the centre, surrounded by a transparent, radiately nerved membranous wing, or wing absent.
Leaves petiolate, deciduous, alternate, subopposite or fasciculate; laminas 10–70 × 0·5–5 mm., linear to linear-lanceolate or lanceolate, tapering base, mucronate, entire; petiole up to 4 mm. long.
Erect or procumbent, sometimes spreading annual (sometimes short-lived perennial) herb up to c. 90 cm. tall, glabrous; stems stiff and freely much-branched.
Perianth-segments up to 2–5 mm. long, unequal, ovate to oblong, acute, with whitish membranous margins.
Flowers whitish, subsessile, separated by large internodes, with small whitish membranous bracteoles.
Staminodes 0–5, evanescent, long-clawed with oblong limb, equalling perianth-segments.
Inflorescence a very diffuse terminal panicled cyme.
Stamens usually 7; filaments ciliate at base.
Ovary compressed.
