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122. Hylodesmum H. Ohashi & R. R. Mill, Edinburgh J. Bot. 57: 173. 2000.

长柄山蚂蝗属 chang bing shan ma huang shu

Authors: Puhua Huang & Hiroyoshi Ohashi

Desmodium sect. Podocarpium Bentham in Miquel, Pl. Jungh. 226. 1852; Podocarpium (Bentham) Y. C. Yang & P. H. Huang (1979), not A. Braun ex Stizenberger (1851), nor Unger (1864).

Perennial herbs or herbaceous subshrubs. Leaves pinnately compound, 3-7-foliolate; leaflets entire or slightly undulate; stipules and stipels present. Racemes terminal, or axillary and terminal, rarely lax panicles, usually 2- or 3-flowered at each node; bracts pres­ent; bracteoles often absent. Calyx broadly campanulate, 4- or 5-lobed (upper lobes fully connate when 4-lobed or minutely 2-toothed at apex when 5-lobed). Standard shortly clawed at base; wings and keel clawed. Stamens monadelphous. Ovary long stipitate or slightly shortly stipitate. Legume 2-5-jointed, lower suture very deeply incised nearly to upper one between articles, upper suture straight or shallowly undulate; articles obliquely triangular or slightly broadly subobovate. Seed without rim-aril; cotyledons hypogeous.

Fourteen species: mostly in E Asia, three in North America; ten species (three endemic) in China.

1 Calyx lobes ca. as long as tube or longer; bracts ovate to broadly ovate   (2)
+ Calyx lobes shorter than tube; bracts narrowly ovate or narrowly triangular   (4)
2 (1) Terminal leaflet entire along margin, base rounded.   10 H. williamsii
+ Terminal leaflet slightly undulate or irregularly undulate along margin, base cuneate   (3)
3 (2) Leaflets caudate or caudate-acuminate at apex, irregularly undulate along margin; roots distinctly tuberous.   8 H. longipes
+ Leaflets shortly acuminate at apex, slightly undulate along margin; roots not tuberous.   9 H. repandum
4 (1) Leaves 5-7-foliolate.   1 H. oldhamii
+ Leaves entirely 3-foliolate   (5)
5 (4) Stems and leaves densely white strigose.   6 H. densum
+ Stems and leaves pubescent or glabrous   (6)
6 (5) Stems and leaves glabrous.   3 H. menglaense
+ Stems and leaves pubescent or subglabrous   (7)
7 (6) Wings and keel petals not clawed at base; stipules linear-lanceolate, 0.5-1 mm, broadest at base.   7 H. podocarpum
+ Wings and keel petals distinctly clawed at base; stipules triangular-lanceolate, lanceolate, or ovate-lanceolate, 2-4 mm, broadest at base   (8)
8 (7) Articles of legume obliquely triangular, 12-14 × 4-6 mm, stipe 10-12 mm; fruiting pedicel 11-13 mm.   2 H. leptopus
+ Articles of legume slightly broadly subobovate, (6-)9-10 × ca. 4 mm, stipe 4-10 mm; fruiting pedicel 4-10 mm   (9)
9 (8) Leaves often clustered at top of stem, terminal leaflet broadly ovate or ovate; legume articles 9-10 mm, stipe ca. 10 mm.   4 H. laxum
+ Leaves often scattered on stem, terminal leaflet lanceolate; legume articles 6-7 mm, stipe 4-6 mm.   5 H. laterale

  • List of lower taxa


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