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106. Amphicarpaea Elliot ex Nuttall, Gen. N. Amer. Pl. 2: 113. 1818.
两型豆属 liang xing dou shu
Authors: Ren Sa & Michael G. Gilbert
Herbs, twining. Leaves pinnately 3-foliolate. Inflorescence axillary, racemose, sometimes with apetalous cleistogamous flowers at base or 1-3 in axils of lower leaves, nodes not swollen but sometimes more than 1-flowered. Bracts persistent or deciduous. Calyx tubular, 4- or 5-lobed. Corolla longer than calyx; petals subequal; standard obovate or obovate-elliptic, glabrous, base clawed, with inconspicuous auricles; keels slightly curved. Stamens diadelphous; vexillary stamen free; cleistogamous flowers with only 3-5 anthers. Ovary sessile or subsessile, with sheathing disk at base; ovules many; style glabrous; stigma small, terminal. Legumes of 2 types: normal and underground; normal legumes linear-oblong, dehiscent, compressed, unjointed, few seeded; underground legumes usually orbicular or ellipsoidal, indehiscent, 1-seeded. Seeds subglobose or ovoid; hilum short, lateral; aril not developed.
About five species: tropical Africa, E Asia, North America; three species (two endemic) in China.
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| 1 |
Perennial herbs; stipules 6-8 mm; leaflets papery or thickly papery. |
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2 A. ferruginea |
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Annual herbs; stipules 3-5 mm; leaflets membranous or nearly so |
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(2) |
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| 2 (1) |
Bracts ovate or elliptic to broadly elliptic; terminal leaflet rhomboid-ovate or oblate-ovate, apex obtuse, sometimes with mucro. |
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1 A. edgeworthii |
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Bracts linear; terminal leaflet ovate to broadly ovate, apex acute. |
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3 A. linearis |
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Lower Taxa
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