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Cleistogamous flowers: bracteoles 2.5–4 mm. long, narrowly linear, glabrous; calyx 3–3.5 mm. long, glabrous; corolla 3.5–4 mm. long, villous within tube; stamens generally two, filaments c. 0.75–1 mm. long; style c. 1.5 mm. long; capsule 2.5 mm. long, dark brown to light brown, opaque, broadly ovoid.
Leaves on aerial stems verticillate to opposite, irregularly pinnatisect to lacerate, 5–8 x 1–2 mm., densely punctate, glabrous, hirsute or yellow-glandular; submerged leaves to 2.5 cm. long, pinnatisect-multifid, segments capillary or more usually flattened, glabrous.
Stems: aerial stems to 20 cm. tall, simple or branching, glabrous to laxly white hirsute or covered lightly with small sessile yellow glands; submerged stems to 60 cm. long, simple or branching, glabrous.
Flowers solitary axillary, sessile, cleistogamous flowers present on submerged stems.
Amphibious perennial.
