齿翅首乌 chi chi shou wu

Polygonum dentatoalatum F. Schmidt in Maximowicz, Mém. Acad. Imp. Sci. St.-Pétersbourg Divers Savans 9: 232. 1859; Bilderdykia dentatoalata (F. Schmidt) Kitagawa; B. scandens (Linnaeus) Greene var. dentatoalata (F. Schmidt) Nakai; Fagopyrum scandens (Linnaeus) H. Gross var. dentatoalatum (F. Schmidt) H. Gross; P. scandens Linnaeus var. dentatoalatum (F. Schmidt) Maximowicz ex Franchet & Savatier; Tiniaria scandens (Linnaeus) Nakai var. dentatoalata (F. Schmidt) Nakai ex T. Mori.

Herb annual. Stems twining, 1-2 m, striate, papillate; branches few. Petiole 2-4 cm, slender, papillate; leaf blade 3-6 × 2.5-4 cm, both surfaces glabrous, along veins minutely papillate, base cordate, margin entire, apex acuminate; ocrea brownish, 3-4 mm, membranous, oblique, not ciliate. Inflorescence axillary or terminal, racemose, leafy, lax, interrupted, 4-12 cm, usually longer than leaves; bracts funnel-shaped, 2-3 mm, membranous, oblique, apex acute, not ciliate, each 4- or 5-flowered. Pedicel short, elongated in fruit, articulate below middle. Perianth white or greenish, 5-parted; tepals unequal in size, accrescent in fruit, outer 3 much longer, winged on abaxial surface; wings dentate, decurrent near base of pedicels. Perianth (including wings) in fruit obovate, 5-6 mm in diam. Stamens 8, included. Styles very short; stigmas capitate. Achenes included in persistent perianth, black, slightly shiny, ellipsoid, trigonous, 4-4.5 mm, minutely granular striate. Fl. Jun-Sep, fr. Jul-Oct.

Mixed forests in valleys, slopes; 200-2800 m. Anhui, Gansu, Guizhou, Hebei, Heilongjiang, Henan, Hubei, Jiangsu, Jilin, Liaoning, Nei Mongol, Qinghai, Shaanxi, Shandong, Shanxi, Sichuan, Yunnan [Japan, Korea, Russia (Far East)].