Aquatic. Rhizoids apparently absent. Stolons filiform, terete, sparsely branched, up to 20 cm long, 0.5-1 mm thick, glabrous. Foliar organs numerous on the stolons, 2-6 cm long, the primary segment divided in 2 or 3 just above the base, then repeatedly divided into very numerous segments, the secondary pinnae ± reflexed, the lowermost somewhat remote from the base which may or may not be provided with sparse stipule-like segments resembling the ultimate segments, the latter capillary, terete, sparsely minutely setulose; the primary segments of the foliar organ basal to the inflorescence often longer, inflated, ± fusiform and bearing fewer shorter ultimate segments. Traps not numerous, lateral on the penultimate and ultimate segments, broadly obliquely ovoid, 1-2 mm long, shortly stalked, mouth lateral with short marginal setae, upper lip with 2 long, branched setiform appendages. Inflorescence erect, 8-30 cm long; peduncle filiform, terete; flowers 6-12, ± distant; scales few, similar to the bracts; bracts medifixed, peltate, inserted shortly above the base of the pedicel, ovate, apex acute, base rounded, membranous, c. 2 mm long, attached below the middle; bracteoles absent; pedicels capillary, terete, erect or ascending, c. 6 mm long at anthesis, up to 15 mm long in fruit. Calyx lobes subequal, the lower slightly smaller, orbicular, membranous, c. 1.5 mm long, scarcely accrescent. Corolla lilac, violet, pink or rarely white, with a yellow spot on the palate, 6-10(-15) mm long, externally glabrous, upper lip transversely elliptic or orbicular, cucul-late, apex rounded, lower lip larger, transversely oblong-elliptic, up to 12 mm wide, base auriculate, apex rounded, lateral margins incurved, palate raised, gibbous, spur conical, slightly curved, apex obtuse, about as long as and ± parallel with the lower lip. Filaments falcate, considerably expanded above, c. 1.5 mm long, anther thecae confluent. Ovary ovoid, style about as long as ovary, stigma lower lip orbicular, upper lip much smaller, deltoid. Capsule ellipsoid, membranous, c. 3 mm long, laterally bivalvate. Seeds few, lenticular, 1.5-2 mm wide, margin winged, deeply irregularly dentate.
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Perennials, freely suspended aquatic. Rhizoids apparently absent. Stolons filiform, branched. Traps on leaves, shortly stalked, broadly obliquely ovoid, 1-2 mm, mouth lateral; appendages 2, dorsal, branched, setiform, with simple shorter setae. Leaves numerous on stolons, 2-6 cm, divided from near base into 2 or 3 primary segments; segments elliptic in outline, dichotomously divided into numerous further segments; ultimate segments capillary, terete, sparsely minutely setulose. Inflorescences erect, 6-20 cm, 5-10-flowered; peduncle terete, 0.6-1 mm thick, glabrous; scales few, similar to bracts; bracts basisolute, ovate, 2-2.5 mm, glandular. Pedicel erect, 3-10 mm, filiform, slightly dorsiventrally compressed; bracteoles absent. Calyx lobes orbicular, convex, 1-1.8 mm; lower lobe slightly smaller, apex truncate to retuse; upper lobe apex rounded. Corolla lilac, violet, or white, with a yellow blotch at base of lower lip, 6-10 mm; lower lip transversely oblong-elliptic to subreniform, base with prominent 2-lobed swelling, apex rounded to retuse; spur narrowly conic, ± as long as and parallel with lower lip, slightly curved, apex truncate to emarginate; palate margin glabrous; upper lip transversely elliptic, cucullate, apex rounded. Filaments ca. 1.5 mm, curved; anther thecae confluent. Ovary broadly ovoid; style evident, glandular; stigma lower lip transversely elliptic, upper lip semicircular to deltoid. Capsule ellipsoid, ca. 3 mm, dehiscing by longitudinal dorsal and ventral slits. Seed few per capsule, lenticular, ca. 2 mm in diam., margin broadly winged, wing irregularly dentate; seed coat with small prominent reticulations. Fl. Jun-Aug, fr. Jul-Sep.
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