9. Vigna minima (Roxburgh) Ohwi & H. Ohashi, J. Jap. Bot. 44: 30. 1969.
贼小豆 zei xiao dou
Phaseolus minimus Roxburgh, Fl. Ind., ed. 1832, 3: 290. 1832; Azukia minima (Roxburgh) Ohwi; P. gracilicaulis Ohwi; P. heterophyllus Hayata (1920), not Willdenow (1809); P. minimus f. heterophyllus Hosokawa; P. minimus f. linearis Hosokawa; P. minimus f. rotundifolius (Hayata) Hosokawa; P. rotundifolius Hayata; Vigna dimorphophylla T. L. Wu; V. gracilicaulis (Ohwi) Ohwi & H. Ohashi; V. lutea A. Gray var. minor Matsumura; V. minima f. heterophylla (Hosokawa) Ohwi & H. Ohashi; V. minima f. linearis (Hosokawa) T. C. Huang & H. Ohashi; V. minima var. minor (Matsumura) Tateishi.
Annual herbs, twining. Stems slender, subglabrous. Stipules peltate, lanceolate, ca. 4 mm, sparsely hirsute; leaflets variable in size and shape, oblong-ovate, suborbicular, linear, linear-lanceolate, or ovate, 2-7 × 0.5-3 cm, subglabrous or sparsely strigose on both surfaces, base rounded or broadly cuneate, apex acute to obtuse. Racemes axillary, slender, 3- or 4-flowered. Bracteoles linear or linear-lanceolate. Calyx campanulate, ca. 3 mm; teeth 5, unequal. Corolla yellow; standard suborbicular, ca. 10 × 8 mm, deflexed; keel with long and acute auricle. Legumes terete, 3.5-6.5 × ca. 0.4 cm, glabrous. Seeds 4-8, dark gray to brownish, oblong, ca. 4 × 3 mm; hilum linear. Fl. and fr. Aug-Oct.
Grasslands, thickets. Fujian, Guangdong, Guangxi, Guizhou, Hainan, Hebei, Hunan, Jiangsu, Jiangxi, Liaoning, Shandong, Shanxi, Taiwan, Yunnan, Zhejiang [India, Japan, Philippines].