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FOC | Family List | FOC Vol. 14 | Apiaceae

58. Sium Linnaeus, Sp. Pl. 1: 251. 1753.

泽芹属 ze qin shu

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

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.

About ten species: Africa, Asia, Europe, North America; five species (one endemic) in China.

1 Calyx teeth lanceolate or minute (E, N, and NE China).   1 Sium suave
+ Calyx teeth minute or inconspicuous (SC and W China).   (2)
2 (1) Plants slender, 5–15 cm; rays 2–3.   5 Sium frigidum
+ Plants stout, 30–90(–150) cm; rays (8–)10–20(–30).   (3)
3 (2) Basal leaf pinnae 2–4 pairs; rays 10–15.   4 Sium sisaroideum
+ Basal leaf pinnae 2–6 pairs; rays 8–30.   (4)
4 (3) Plants 30–60(–80) cm; leaflets 0.5–1 cm broad.   2 Sium medium
+ Plants 70–150 cm; leaflets, 0.8–2 cm broad.   3 Sium latifolium

Lower Taxa


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