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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.