两型豆 Amphicarpaea edgeworthii

  • Scientific Name: Amphicarpaea edgeworthii Benth.
  • Ref: F.A.W.Miquel, Pl. Jungh.: 231. 1852
  • Synonyms: Amphicarpaea japonica (Oliv.) B.Fedtsch.; Falcata edgeworthii (Benth.) Kuntze; F. japonica (Oliv.) Kom.; Shuteria trisperma Miq.
  • English Common Name: Chinese hog-peanut
  • Chinese Common Name: 两型豆 liǎngxíng∙dòu, 三籽两型豆 sānzǐ liǎngxíng∙dòu, 阴阳豆 yīnyáng∙dòu
  • Japanese Common Name: ヤブマメ [藪豆/薮豆] yabumame
  • Family: Fabaceae
  • Genus: Amphicarpaea
  • Distribution: Mountain slopes, roadsides, fields, grasslands; 300-3000 m. An­hui, Fujian, Gansu, Guizhou, Hainan, Hebei, Heilongjiang, Henan, Hubei, Hunan, Jiangsu, Jiangxi, Jilin, Liaoning, Nei Mongol, Shaanxi, Shandong, Shanxi, Sichuan, Taiwan, Xizang, Yunnan, Zhejiang [India, Japan, Korea, Russia, Vietnam].
  • Photo: Mt. Tianmu, Zhejiang
Herbs, annual, 0.3-1.3 m tall. Stems slender. Stipules lan­ceolate or ovate-lanceolate, 3-4 mm, densely pubescent; petiole 2-5.5 cm; stipels extremely small, usually deciduous, narrowly triangular; petiolules usually 2-3 mm; leaflets papery or almost membranous; terminal leaflet rhomboid-ovate or oblate-ovate, 2.5-5.5 × 2-5 cm, both surfaces sparsely yellowish brown vil­lous, base rounded, broadly cuneate or nearly truncate, apex ob­tuse or sometimes with mucro; lateral leaflets usually obliquely ovate or ovate-rhombic, dimorphic. Upper inflorescences axil­lary, shortly racemose; bracts almost membranous, ovate to elliptic, 3-5 mm. Cleistogamous flowers often present. Nor­mal flowers: pedicel 1-2 mm. Calyx tubular, 5-7 mm, 5-lobed; lobes unequal, sparsely pubescent, apex acuminate. Corolla purplish or white; petals subequal; standard obovate, 1-1.7 cm; wings oblong, with long stipes and acute auricles at base; keels similar to wings. Ovary hairy. Cleistogamous flowers under­ground, sessile; style curved. Legumes dimorphic: those of nor­mal flowers oblong or obovate-oblong, 2-3.5 × ca. 0.6 cm, compressed, 2-5-seeded; legumes of cleistogamous flowers elliptic or suborbicular, 1-4-seeded. Seeds reniform-orbicular, 2-4 × 2-3 mm; hilum short. Fl. and fr. Aug-Nov. 2n = 40. (Flora of China)

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