Perennials, amphibious. Stems slender, long, glandular. Submerged leaves whorled; leaf blade bipinnately segmented; segments capillary. Aerial leaves pinnately lobed; leaf blade 0.5-3 cm, glabrous, densely glandular; vein 1. Flowers in axil of each leaf, solitary, sessile at first, then pedicel elongating to 2-6 mm in fruit, densely glandular. Bracteoles absent. Calyx narrowly campanulate, ca. 2 mm, outside densely glandular; lobes triangular-lanceolate, ca. 1 mm, apex acute. Corolla reddish, funnelform, ca. 4 mm. Capsule subglobose, compressed, ca. 3 mm; persistent calyx as long as capsule. Seeds black-brown, oblong, ca. 0.4 mm. Fl. and fr. Jul-Sep.
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