丛枝蓼 cong zhi liao

Persicaria posumbu (Buchanan-Hamilton ex D. Don) H. Gross; P. yokusaiana (Makino) Nakai; Polygonum caespitosum Blume; P. caespitosum subsp. yokusaianum (Makino) Danser; P. procumbens Y. L. Chang & S. X. Li (1959), not Gilibert (1792), nor Bruijn (1854), nor Sessé y Lacasta & Mociño (1894); P. pronum C. F. Fang; P. yokusaianum Makino.

Herbs annual. Stems decumbent, 30-70 tall, slender, branched at base, glabrous, angulate. Petiole 5-7 mm, appressed hispid; leaf blade ovate-lanceolate or ovate, 3-6(-8) × 1-2(-3) cm, papery, both surfaces sparsely appressed hispid or glabrescent, midvein prominent abaxially, base broadly cuneate, margin ciliate, apex caudate-acuminate; ocrea tubular, 4-6 mm, thinly membranous, appressed hispid, apex truncate, cilia 7-8 mm, stout. Inflorescence terminal or axillary, spicate, lax, 5-10 cm, interrupted below; bracts greenish, funnel-shaped, glabrous, margin ciliate, each 3- or 4-flowered. Pedicel short. Perianth pinkish, 5-parted; tepals elliptic, 2-2.5 mm. Stamens 8, exserted. Styles 3, connate at base; stigmas capitate. Achenes included in persistent perianth, blackish brown, shiny, ovoid, trigonous, 2-2.5 mm. Fl. Jun-Sep, fr. Jul-Oct.

Mixed forests on mountain slopes, moist valleys; 100-3000 m. Anhui, Fujian, Gansu, Guangdong, Guangxi, Guizhou, Hainan, Heilongjiang, Henan, Hubei, Hunan, Jiangsu, Jiangxi, Jilin, Liaoning, Shaanxi, Shandong, Sichuan, Taiwan, Xizang, Yunnan, Zhejiang [India, Indonesia, Japan, Korea, Myanmar, Nepal, Philippines, Thailand].