Chiba bean legume Phaseolus angularis (Willd.) W. F. Wight. the seeds. Scientific name: Vigna umbellata "Ben Jing" called red beans, "Rihuazi Materia Medica" called also beans, "Materia Medica Compendium" called red beans, "Materia Medica Primitive" is also known as red beans, "Lu Chuan Materia Medica" is also known as red and green beans, lice thumb beans. The Chinese herbal medicine handbook is called Zhu Chibou, the herbal medicine is also known as gold red beans, Zhu Xiaodou, the scripture Feng Yuan is called pig liver red, the herb reads, also called Du Chibou. To grain tight, color purple, red is good, boiled juice to eat the strong force, swelling and lactation effect is very effective. In summer and fall, pick mature pods in batches, sun-dry, hit the seeds, remove impurities, and then sun-dry. Annual herb, 50~100 cm tall. Stem erect, being spreading hirsute. Leaves alternate, ternate-complex, long-petiolate, stipules lanceolate or ovate-lanceolate; apical leaflets ovate-orbicular, 5-10 cm long, 3-6 cm wide, apex acuminate, base subrounded, lateral leaves oblique, entire or 3-lobed, both surfaces white pilose. Racemes axillary; calyx 5-lobed; corolla butterfly-shaped, yellow; stamens 10, dimorphic. Pods terete, contracted between seeds, glabrous, 5-8 cm long, with 6-8 seeds. Seeds long cylindrical, truncated or rounded at both ends, dark red or russet. Flowering in July-August, fruiting in August-September.