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22. Chamaesium H. Wolff, Notizbl. Bot. Gart. Berlin-Dahlem. 9: 275. 1925.
矮泽芹属 ai ze qin shu
Pan Zehui (潘泽惠); Mark F. Watson, Eugene V. Kljuykov
Herbs, perennial, small, glabrous. Stem solitary, ribbed, base usually covered by papery dark purple-brown remnant sheaths. Leaf blade oblong, pinnate; pinnae opposite, sessile, ovate to orbicular, entire or 3–6-lobed to serrate. Umbels compound, terminal and lateral. Bracts absent or few; rays unequal; bracteoles absent or few; pedicels many, short. Calyx teeth minute, semi-orbicular or ovate-triangular. Petals white, yellowish or greenish, obovate or suborbicular, base narrow, apex nearly plane, usually not inflexed. Stylopodium depressed, margins conspicuously extended into a broad undulate flange. Fruit ellipsoid-oblong, base slightly cordate, smooth; ribs 9, 5 primary and 4 secondary ribs all prominent to narrowly winged, wings undulate; vittae 1 in each furrow, 2 on commissure. Seed face concave. Carpophore parted to base, rather thick.
Eight species: mainly at high altitudes from E Himalayas to SW China; seven species (four endemic) in China.
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| 1 |
Ultimate segments of leaves linear, 1–2 mm wide. |
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1 Chamaesium wolffianum |
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Ultimate segments of leaves suborbicular, broadly ovate to ovate-lanceolate, 2–17 mm wide. |
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(2) |
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| 2 (1) |
Bracts and bracteoles absent. |
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2 Chamaesium delavayi |
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Bracts or bracteoles present. |
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(3) |
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| 3 (2) |
Bracteoles absent, rarely 1–2, abortive; pinnae 2–4 pairs. |
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3 Chamaesium viridiflorum |
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Bracteoles well developed; pinnae (2–)4–6 pairs. |
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(4) |
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| 4 (3) |
Ultimate segments of leaves ovate to ovate-lanceolate; bracteoles linear, entire, often shorter than flowers. |
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4 Chamaesium paradoxum |
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Ultimate segments of leaves long-ovate, broadly ovate to suborbicular; bracteoles linear to long-
obovate, entire, lobed to pinnatifid, equal to or much longer than flowers. |
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(5) |
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| 5 (4) |
Ribs of fruit extended into undulate wings (Xizang). |
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7 Chamaesium mallaeanum |
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Ribs of fruit prominent, not undulate-winged. |
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(6) |
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| 6 (5) |
Plants usually stemless, less than 15 cm tall, unbranched; bracteoles linear to long-obovate,
entire to pinnatifid. |
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5 Chamaesium novemjugum |
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Plants usually with long stems more than 15 cm tall, branched above; bracteoles linear, entire to 3-toothed. |
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6 Chamaesium thalictrifolium |
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Lower Taxa
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Treatments in Other Floras @ www.efloras.org
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