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