Annual herb, mat-forming or shortly erect, glabrous or rarely scabrous; stems to 20 cm long. Leaves (1.5–)2–10(–17) mm long. Pedicles (3–)6–14.5(–20) mm long, usually deflexed in fruit. Sepals elliptic to ovate, 1.3–2(–2.4) mm long, obtuse or acute, apex folded over to form a hood; petals 2–3.2(–4) mm long, deeply bifid; stamens usually 10, filaments to 3 mm long. Seeds 4–9, ellipsoid or suborbicular; tubercules narrow and flattened, and somewhat ridge-like.
MuM, Wim, GleP, Brid, VVP, VRiv, MSB, RobP, MuF, GipP, Gold, CVU, GGr, DunT, NIS, EGU, HSF. Also NSW. Scattered throughout coastal and inland wetlands.
