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Perennials, rarely annuals, with branches often up to 0.3 m, little branched, with upper branches often floating but still attached to underground rhizome. Leaves lanceolate to triangular, (8-)10-20 x 2-3(-5) mm, obtuse, dorsiventrally flattened and slightly fleshy, glabrous, green. Inflorescence a thyrse with sessile dichasia often ending in monochasia in a leaf axil due to sympodial growth, with 4-merous flowers. Calyx: lobes broadly triangular, 0.3-0.5 mm long, glabrous. Corolla more or less cup-shaped, scarcely fused at base, white; lobes obovate, l.5-2(-2.5) mm long, obtuse, usually strongly recurved from the middle. Stamens with yellow to purple anthers. Squamae oblong-cuneate, 0.4-0.6 x 0.2-0.3 mm, truncate or with rounded apices, usually abruptly constricted downwards, membranous or almost so, white or pale yellow.
Perennial hydrophyte, branches ± 0.3 m long, upper branches floating in water, but still attached to underground rhizome. Leaves lanceolate to triangular, 10-20 x 2-3 mm, glabrous, green, slightly fleshy. Inflorescence a thyrse with sessile dichasia ending in monochasia in leaf axil. Corolla shallowly cup-shaped, scarcely fused at base, white, 1-2 mm long, later reflexed; lobes obovate, 1.5-2.0 mm long, strongly recurved from middle. Flowering time Nov.-Mar.
Perennial herb. Stems up to 0.3 m long, upper branches often floating but still attached to underground rhizome. Leaves slightly fleshy; blade narrowly ovate to triangular, 10-20 x 2-3 mm, apex obtuse, dorsiventrally compressed, glabrous, green. Flowers: in a thyrse with sessile dichasia; 4-merous; anthers yellow to purple; calyx lobes obtuse; corolla cup-shaped, lobes obovate, 1-2 mm long, apices obtuse, strongly recurved, white; Oct.-Mar.
Hydrophytic perennial shrublet with branches up to 300 mm. Leaves lanceolate to ovate. Inflorescence with 5-10(-20) flowers in axils of leaves. Flowers star-shaped. Petals 1-2 mm long. Flowers white to pink.
Aquatic, rhizomatous perennial, or rarely annual, like C. natans but leaves lanceolate to triangular and broadest near stem, often with 5-10 flowers per axillary cluster, (-20 in vigorous plants).
Like C. natans but leaves broadest below, lanceolate to ovate, and flowers mostly 5-10(-20) per axil.
