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Herbs perennial, aquatic or along water margins, glabrous throughout. Roots fascicled, fusiform or fibrous. Stem solitary, striate, branched, rooting at lower nodes. Basal leaves petiolate, sheathing; leaf blade 1-pinnate; pinnae sessile, remote. Umbels compound, terminal and lateral; bracts and bracteoles present, usually recurved; rays spreading-ascending. Calyx teeth conspicuous or minute, often unequal. Petals white, obovate or subround, base cuneate, apex notched with small incurved lobule, outer petals in umbellule sometimes enlarged (radiant). Stylopodium short-conic; styles divergent or reflexed. Fruit ovoid or ellipsoid, slightly compressed laterally, glabrous; ribs prominent, corky-thickened or obscure; vittae 1–3 in each furrow, 2–6 on commissure. Seed face plane. Carpophore 2-cleft to base.
Fr somewhat flattened laterally, ovate to orbicular, slightly constricted at the commissure, the ribs prominent and corky; oil-tubes 1–3 per interval, 2–6 on the commissure; umbels terminal and lateral, compound, with 6–many rays; bracts 2–several, lanceolate, reflexed; umbellets compact; bractlets slightly smaller than the bracts; sep minute or none; pet white, the outer sometimes slightly enlarged; stylopodium mostly depressed; usually tall, branched, glabrous perennials (sometimes annual?) with once pinnate lvs and 5–many elongate serrate lfls. 8, N. Temp. and S. Afr.
Petals white to yellowish, more or less equal, relatively broad with an incurved apex, rarely the outer becoming subradiate.
Flowers all hermaphrodite, in terminal and lateral compound umbels; bracts and bracteoles numerous and conspicuous.
Ribs filiform, fairly prominent, lateral ribs marginal; mericarps sub-pentagonal in section, endosperm similar.
Fruit ovoid-cylindrical to globose, slightly compressed laterally and constricted at the commissure.
Stylopodium conical or sometimes depressed; styles short and stiff, divergent.
Vittae superficial, 1–6 in each interval and 2–6 in the commissural face.
Carpophore entire or 2-partite at the apex.
Robust glabrous herbs with pinnate leaves.
Sepals well developed to minute.
