Aquatic annual (? or perennial) herb 20–30 cm. long; stems submerged, leafless below, usually ± branched and leafy above.. Leaves opposite (rarely alternate), lanceolate, 0.3–1.5 cm. long, 0.5–1.5 mm. wide, attenuate at the apex, the actual tip truncate or emarginate, attenuate at the base, spreading or reflexed, 1-nerved.. Flowers pink, 5-merous, sessile, solitary in the axils; bracteoles linear-filiform, 1.25 mm. long, exceeding the calyx-tube.. Calyx campanulate-urceolate; tube ± 1 mm. long; lobes triangular, 0.4 mm. long, 0.5 mm. wide, acute; appendages narrowly triangular, 0.3 mm. long.. Petals absent.. Stamens 2; filaments ± 0.4 mm. long.. Ovary ellipsoid, 0.5 mm. wide, 3-locular; style 0.25 mm. long.. Capsule reddish, subglobose, 1–1.2 mm. long.. Seeds yellowish, ellipsoid, 0.25 mm. long.. Fig. 15/15–18, p. 53.
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