39b. Vicia sativa subsp. nigra Ehrhart, Hannover Mag. 15: 229. 1780.
窄叶野豌豆 zhai ye ye wan dou
Vicia sativa var. angustifolia Linnaeus, Fl. Suec., ed. 2, 255. 1755; V. angustifolia Linnaeus; V. pilosa M. Bieberstein; V. sativa subsp. angustifolia (Linnaeus) Battandier; V. sativa var. nigra Linnaeus, nom. illeg. superfl.
Leaflets linear to oblong-cuneate, apex acute, obtuse, or truncate. Calyx: teeth shorter than tube. Corolla (8-)10-18 mm. Legume black or brownish black, not contracted between seeds, 25-55 × (2.5-)3-6 mm, usually glabrous. Fl. Mar-Jul, fr. Mar-Sep. 2n = 10, 12, 14.
Damp grassy places, valleys, riverbanks and beds, farms, fields, open wastelands, roadsides; 200-3700 m. Fujian, Guizhou, Hunan, Sichuan, Taiwan, Xinjiang, Xizang [Afghanistan, Bhutan, Kazakhstan, Kyrgyzstan, Mongolia, Nepal, Pakistan, Russia, Tajikistan, Turkmenistan, Uzbekistan; Africa, SW Asia, Europe; introduced and naturalized in temperate regions elsewhere].
