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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.

1 Ultimate segments of leaves linear, 1–2 mm wide.   1 Chamaesium wolffianum
+ Ultimate segments of leaves suborbicular, broadly ovate to ovate-lanceolate, 2–17 mm wide.   (2)
2 (1) Bracts and bracteoles absent.   2 Chamaesium delavayi
+ Bracts or bracteoles present.   (3)
3 (2) Bracteoles absent, rarely 1–2, abortive; pinnae 2–4 pairs.   3 Chamaesium viridiflorum
+ Bracteoles well developed; pinnae (2–)4–6 pairs.   (4)
4 (3) Ultimate segments of leaves ovate to ovate-lanceolate; bracteoles linear, entire, often shorter than flowers.   4 Chamaesium paradoxum
+ 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.   (5)
5 (4) Ribs of fruit extended into undulate wings (Xizang).   7 Chamaesium mallaeanum
+ Ribs of fruit prominent, not undulate-winged.   (6)
6 (5) Plants usually stemless, less than 15 cm tall, unbranched; bracteoles linear to long-obovate, entire to pinnatifid.   5 Chamaesium novemjugum
+ Plants usually with long stems more than 15 cm tall, branched above; bracteoles linear, entire to 3-toothed.   6 Chamaesium thalictrifolium

Lower Taxa


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