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General:
Perennial herb, floating or matted; stems prostrate or ascending, 10-50 cm long, rooting at nodes, well branched, succulent, glabrous.
Leaves:
Opposite, narrowly elliptic or egg-shaped, 2-6 cm long, tapered gradually to broad stalks that are about same length, entire.
Flowers:
Inflorescence of several pairs of unstalked flowers, 1 flower per axil of upper leaves; petals lacking; sepals 4, egg-shaped, about 2 mm long, greenish, persistent; stamens 4; anthers 0.2-0.4 mm long, longer than filaments; stigmas globe-shaped.
Fruits:
Capsules, 2.5-4 mm long, 4-sided, oblong, top-shaped above, with 2 tiny bracts at base; seeds numerous, glabrous, 0.5-0.7 mm long.
Source: The Illustrated Flora of British Columbia
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