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117. Dendrolobium (Wight & Arnott) Bentham in Miquel, Pl. Jungh. 215, 216. 1852.

假木豆属 jia mu dou shu

Authors: Puhua Huang & Hiroyoshi Ohashi

Desmodium subg. Dendrolobium Wight & Arnott, Prodr. Fl. Ind. Orient. 223. 1834.

Shrubs or small trees. Leaves 3-foliolate or rarely 1-foliolate, stipulate and stipellate; leaflets entire or shallowly undulate, ter­minal leaflet larger than lateral ones, lateral leaflets often oblique at base. Inflorescences axillary, subumbellate or umbellate to shortly racemose, densely flowered; bracts scarious, striate. Calyx campanulate or tubular, 5-lobed; upper 2 lobes connate, appearing 4-lobed or minutely 2-toothed at apex; lower lobe longer than others. Corolla white or pale yellow; standard obovate, elliptic, or nearly orbicular, clawed, not auriculate; wings narrowly oblong, clawed, auriculate or not. Stamens monadelphous. Ovary sessile, (1 or)2-8-ovuled. Legume ± moniliform, 1-8-jointed, indehiscent when mature. Seed distinctly rim-arillate; cotyledons epigeous.

Eighteen species: tropical and subtropical Asia and Australia; five species (one endemic) in China.

1 Legume 1-jointed; terminal leaflet narrowly oblong to narrowly oblong-lanceolate, 2-5 × 0.9-1.9 cm.   1 D. lanceolatum
+ Legume 2-8-jointed; terminal leaflet usually elliptic-ovate to broadly elliptic-ovate, length:width ratio < 2:1   (2)
2 (1) Legume usually 2-jointed; terminal leaflet shorter than 3 cm; lateral veins 5-9 on each side of midvein and not reaching margin.   2 D. dispermum
+ Legume 3-8-jointed; terminal leaflet longer than 3 cm; lateral veins 7-17 on each side of midvein and reaching margin   (3)
3 (2) Lower calyx lobes ca. as long as other lobes; terminal leaflet acute or obtuse at apex.   4 D. umbellatum
+ Lower calyx lobes longer than other lobes; terminal leaflet acuminate, rounded, or sometimes acute at apex   (4)
4 (3) Young shoots sharply triangular; terminal leaflet narrowly obovate-elliptic, apex acuminate to long acuminate; umbels 20-30-flowered.   3 D. triangulare
+ Young shoots terete; terminal leaflet not as above; umbels 10-20-flowered   (5)
5 (4) Terminal leaflet elliptic to orbicular or ovate to broadly ovate, lateral leaflets ± oblique at base; keel distinctly broader than wings.   4 D. umbellatum
+ Terminal leaflet rhombic or obovate, lateral leaflets usually distinctly oblique at base; keel slightly broader than wings.   5 D. rugosum

Lower Taxa


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