酱头 jiang tou

Polygonum denticulatum C. C. Huang, Acta Bot. Yunnan. 6: 288. 1984.

Herbs perennial. Rhizomes nearly globose, large, to 20 cm in diam. Stems twining, 2-5 cm, striate, glabrous, sparsely papillate, slightly ligneous at base, much branched; branchlets slender, angulate, minutely papillate. Petiole 2-6 cm, sparsely minutely papillate; leaf blade ovate or ovate-triangular, 4-11 × 3-6 cm, both surfaces glabrous, minutely papillate along veins, base broadly cordate, margin repand or subentire, apex acuminate; ocrea purplish, 4-6 mm, membranous, oblique, apex acute. Inflorescence axillary or terminal, paniculate, lax, 10-15 cm; bracts funnel-shaped, ca. 2 mm, glabrous, each 1- or 2-flowered. Perianth white, 5-parted; tepals narrowly elliptic, 3-4 mm. Stamens 8, included. Styles 3, connate to below middle; stigmas capitate. Achenes included in persistent perianth, ovoid, trigonous. Fl. Jun-Aug, fr. Jul-Sep.

* Thickets in valleys; ca. 2500 m. ?Guizhou, ?Xizang, Yunnan (Gengma).

This species is used medicinally.