Native, warm season, perennial, aquatic herb. Stems are mostly 5–6 mm diam and root at the nodes in fully emergent plants. Emergent stems are sparsely or densely papillose. Emergent leaves occur in whorls of 5 or 6, and are linear with numerous short teeth, usually 25–45 mm long and about 3 mm wide. Plants are monoecious, with male and female flowers occurring on the same shoot, often in groups of 2 or 3 in the axils. Male flowers are sessile; sepals mostly lanceolate; petals 2.5–3.5 mm long, white. Female flowers are very shortly pedicellate; sepals and petals absent; stigmas deep reddish purple. Mericarps are green to reddish purple, narrowly ovoid, up to 1 mm long and coarsely papillose.
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