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Cleistogamous flowers; bracteoles 2.5–6 mm. long, narrowly linear, glabrous; calyx 3–6 mm. long, glabrous; corolla 3.5–4.75 mm. long, glabrous to sparsely villous within tube; stamens four with contiguous anthers, filaments c. 0.25 mm. long, anthers as above; style 0.75–1 mm. long; capsule 2.25–4 mm. long, light brown, translucent, broadly ovoid, emarginate to subspherical.
Leaves on aerial stems verticillate, irregularly pinnatisect to lacerate, 4–18 x 1–6 mm., glabrous, densely punctate, frequently with sessile yellow glands; submerged leaves to 2.5 cm. long, pinnatisect-multifid, segments capillary or more usually flattened, glabrous.
Flowers solitary, axillary, sessile on submerged stems, solitary or clustered on very short axillary few-flowered racemes on aerial stems; cleistogamous flowers usually present on submerged stems.
Stems: aerial stems to 10 cm. tall, simple or rarely branching except at base, glabrous to sparsely hirsute, particularly above; submerged stems to 35 cm. long, branching, glabrous.
Amphibious perennial.
