Description from Flora of China
Ervum hirsutum Linnaeus, Sp. Pl. 2: 738. 1753; Vicia coreana H. Léveillé; V. hirsuta var. hefeiana J. Q. He; V. taquetii H. Léveillé; Vicioides hirsuta (Linnaeus) Moench.
Herbs annual, 15-90(-120) cm tall. Stem climbing, slender, glabrescent. Leaves paripinnate; stipules semisagittate or lanceolate, margin 2- or 3-toothed at base; leaflets 4-8-paired, linear or narrowly oblong, 5-15 × 1-3 mm, glabrous; tendril branched. Raceme obviously shorter than leaf, densely 2-4(-7)-flowered at apex of rachis. Calyx campanulate. Corolla white to light purple, rarely pink, 2-4(-5) mm; standard elliptic, subequaling wings and longer than keel. Ovary sessile, densely rigidly hairy; ovules 2. Legume oblong-rhomboid, 5-10 × 2-5 mm, hirsute. Seeds 2, oblate-spheroid. Fl. Feb-Jun, fr. Feb-Aug. 2n = 12, 14.
"Ervum filiforme" (Wallich, Numer. List, no. 5955. 1831) belongs here but is a nomen nudum and was therefore not validly published.
Valleys, grassy slopes, grasslands, creek banks, along streams, farms, fields and field margins, villages, gardens, cultivated areas, roadsides; sea level to 2900 m. Anhui, Fujian, Gansu, Guangdong, Guangxi, Guizhou, Jiangsu, Qinghai, Shaanxi, Sichuan, Taiwan, Xinjiang, Yunnan, Zhejiang [Afghanistan, Bhutan, N India, Japan, Korea, Nepal, N Pakistan, Russia, Turkmenistan; Africa, C and SW Asia, N Atlantic islands, Europe; introduced and naturalized elsewhere].