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FOC | Family List | FOC Vol. 14 | Apiaceae

61. Oenanthe Linnaeus, Sp. Pl. 1: 254. 1753.

水芹属 shui qin shu

Pu Fading (溥发鼎 Pu Fa-ting); Mark F. Watson

Dasyloma de Candolle; Phellandrium Linnaeus.

Herbs, perennial, glabrous. Roots fibrous or fusiform to ovoid tubers. Stems erect, branching, decumbent, weakly diffuse or stoloniferous, hollow, angular, striate, rooting at basal nodes. Basal and lower leaves petiolate, wholly sheathing; blade 1–4-pinnate, homomorphic or heteromorphic to the cauline leaves. Umbels compound, loose, terminal and axillary or leaf-opposed; bracts absent, or occasionally 1; rays 4–15(–30); bracteoles numerous. Calyx teeth prominent, lanceolate, nearly as long as stylopodium. Petals white or pale pink, obovate, base cuneate, apex emarginate, with small incurved lobule, outer petals in umbellule usually enlarged (radiant). Stylopodium conic; styles elongate, erect or divergent, sometimes reflexed in fruit. Fruit ovoid or subglobose, slightly compressed dorsally or laterally, glabrous; dorsal and intermediate ribs slightly thickened, corky, or somewhat protruding, filiform, subequal; lateral ribs dilated, subtriangular, corky; vittae solitary in each furrow, 2 on commissure. Seed face plane. Carpophore obsolete.

Between 25 and 30 species: Africa, Asia, Europe, North America; five species in China.

1 Dorsal and intermediate fruit ribs thickened, corky; leaves homomorphic, ultimate segments ovate or rhombic-ovate, 2–6 × 1–2 cm.   1 Oenanthe javanica
+ Dorsal and intermediate fruit ribs slightly thickened, corky, or somewhat protruding, filiform; leaves homomorphic or heteromorphic, ultimate segments linear, lanceolate, rarely ovate or rhombic-ovate, smaller, 1–3 × 0.5–1 cm.   (2)
2 (1) Peduncles 0.5–1(–2) cm, or obsolete; ultimate segments rhombic-ovate, rarely lanceolate.   2 Oenanthe benghalensis
+ Peduncles 2–25 cm; ultimate segments linear, lanceolate, rarely rhombic-ovate.   (3)
3 (2) Leaves 1-pinnate, pinnae mostly reduced, rachis only with a few subulate and remote pinnae.   3 Oenanthe hookeri
+ Leaves 1–4-pinnate, pinnae not reduced.   (4)
4 (3) Leaves 1–2-pinnate, ultimate segments linear, 20–40 × 1–2 mm, rarely rhombic-ovate.   4 Oenanthe linearis
+ Leaves 3–4-pinnate, linear, minute, 2–3 × 1–2 mm.   5 Oenanthe thomsonii

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