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