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FOC | Family List | FOC Vol. 10 | Fabaceae

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.

1 Perennial herbs; stipules 6-8 mm; leaflets papery or thickly papery.   2 A. ferruginea
+ Annual herbs; stipules 3-5 mm; leaflets membranous or nearly so   (2)
2 (1) Bracts ovate or elliptic to broadly elliptic; terminal leaflet rhomboid-ovate or oblate-ovate, apex obtuse, sometimes with mucro.   1 A. edgeworthii
+ Bracts linear; terminal leaflet ovate to broadly ovate, apex acute.   3 A. linearis

Lower Taxa


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