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65. Derris Loureiro, Fl. Cochinch. 2: 423, 432. 1790.
鱼藤属 yu teng shu
Authors: Dezhao Chen & Les Pedley
Brachypterum (Wight & Arnott) Bentham; Dalbergia subg. Brachypterum Wight & Arnott.
Lianas, rarely erect shrubs or trees. Stipules small. Leaves imparipinnate; stipels absent; leaflets opposite, margins entire. Inflorescences axillary pseudoracemes, these often combined with terminal or axillary pseudopanicles; rachis nodes with 1 to many flowers, fascicled or on a short spur or branchlet; bracts and bracteoles small, deciduous. Calyx campanulate or cup-shaped, apex subtruncate or with 4 or 5 short and broad teeth. Corolla white, purplish red, or pink, longer than calyx; standard broad, usually glabrous but outside sometimes subglabrous or pubescent, without basal calluses; wings long clawed, often auriculate, adhering to keel; keels incurved, base often auriculate, apex blunt. Stamens monadelphous. Ovary sessile or with a short stipe, with 1-11 ovules; style incurved; stigma capitate. Legume globose, oblong, or ligulate-oblong, indehiscent; adaxial suture or both adaxial and abaxial sutures with a narrow wing. Seeds 1 to several per legume, reniform, compressed.
About 50 species: tropical and subtropical Africa, Asia, Australia, and Pacific islands; 16 species (nine endemic) in China.
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| 1 |
Legume winged only on adaxial suture |
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(2) |
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Legume winged on both sutures |
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(6) |
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| 2 (1) |
Leaves more than 13-foliolate |
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(3) |
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Leaves 11-foliolate or less |
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(4) |
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| 3 (2) |
Leaflet blades 1.5-4 cm; trees. |
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1 D. robusta |
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Leaflet blades 5-7.5 cm, lianas. |
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2 D. eriocarpa |
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| 4 (2) |
Leaves (3 or)5(or 7)-foliolate. |
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5 D. trifoliata |
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Leaves 7-11-foliolate |
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(5) |
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| 5 (4) |
Leaflet blades abaxially densely puberulent. |
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3 D. yunnanensis |
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Leaflet blades abaxially glabrous. |
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4 D. harrowiana |
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| 6 (1) |
Leaflet blades abaxially pubescent or puberulent |
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(7) |
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Leaflet blades abaxially glabrous |
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(8) |
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| 7 (6) |
Branchlets robust, densely rust-colored pubescent; leaves 5-9-foliolate, leaflet blades adaxially shiny; legume with wing of abaxial suture only slightly narrower than wing of adaxial suture. |
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6 D. ferruginea |
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Branchlets slender, glabrescent; leaves 5-foliolate, leaflet blades adaxially not shiny; legume with wing of abaxial suture almost 1/2 width of adaxial suture wing. |
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7 D. cavaleriei |
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| 8 (6) |
Flowers in pseudoracemes |
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(9) |
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Flowers in pseudopanicles |
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(12) |
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| 9 (8) |
Leaflet blade apices caudate-acuminate; calyx glabrous. |
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8 D. caudatilimba |
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Leaflet blade apices obtusely acuminate to shortly acuminate; calyx puberulent or pilose |
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(10) |
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| 10 (9) |
Legume adaxial wing ca. 5 mm wide, abaxial wing 1-2 mm wide. |
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11 D. tonkinensis |
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Legume adaxial wing 3-5 mm wide, abaxial wing 0.5-1 or 2-3 mm wide |
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(11) |
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| 11 (10) |
Leaves 5- or 7-foliolate; legume abaxial wing 2-3 mm wide. |
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9 D. breviramosa |
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Leaves 7-13-foliolate; legume abaxial wing 0.5-1 mm wide. |
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10 D. scabricaulis |
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| 12 (8) |
Rachis of inflorescences pilose, hispidulous, or pubescent |
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(13) |
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Rachis of inflorescences glabrous |
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(15) |
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| 13 (12) |
Trees or climbing shrubs. |
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11 D. tonkinensis |
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Lianas |
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(14) |
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| 14 (13) |
Leaves 5- or 7-foliolate, leaflet blades thickly papery to thinly leathery; legume 4-10 cm, thinly leathery. |
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12 D. fordii |
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Leaves (3 or)5-foliolate, leaflet blades leathery; legume 2-5 cm, leathery. |
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13 D. alborubra |
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| 15 (12) |
Leaflet blades 5, closely inserted on a very short rachis, forming subpalmate leaves. |
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16 D. palmifolia |
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Leaflet blades 5 or 7, forming distant pinnate leaves |
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(16) |
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| 16 (15) |
Leaflet blades obovate-elliptic to obovate; flowers fascicled on branches of inflorescences. |
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14 D. marginata |
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Leaflet blades elliptic; flowers scattered on branches of inflorescences. |
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15 D. laxiflora |
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List of lower taxa
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Treatments in Other Floras @ www.efloras.org
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