Delicate, succulent, annual herb sometimes flowering when 1 cm high, occasionally much elongated with branched stems to 10 cm long; branches ± flattened with membranous wings, usually laxly ascending, occasionally rooting at nodes but not mat-forming, glabrous or with sparse flattened jointed hairs. Lvs sessile, 4–6–(8) × (2)–4–6 mm, glabrous or setose on margins and tips, occasionally with glandular hairs; upper ?-1/2 digitately divided into (3)–5–7 acute to acuminate, linear, subequal, spreading segments. Fls on flattened pedicels to 20 mm long. Calyx 4–5–(7) mm long, glabrous or setose on margins and tips, divided ?-1/2 way. Corolla white, 8–15 mm long. Anthers yellow to golden brown; margins glabrous or nearly so; awns slender, almost equal. Capsule > calyx, 2–3 × 1.5–2.5 mm.
[From: Webb et al. (1988) Flora of New Zealand. Volume 4.]
Flowering: Jan.–Apr.