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FOC | Family List | FOC Vol. 5 | Polygonaceae | Polygonum

80. Polygonum tortuosum D. Don, Prodr. Fl. Nepal. 71. 1825.

叉枝神血宁 cha zhi shen xue ning

Aconogonon tortuosum (D. Don) H. Hara; A. tortuosum var. tibetanum (Meisner) S. P. Hong; Pleuropteropyrum tortuosum (D. Don) Munshi & Javeid; Polygonum peregrinatoris Paulsen; P. tortuosum var. tibetanum Meisner.

Subshrubs. Roots robust. Stems erect, red-brown, 30-50 cm tall, glabrous or pubescent; branches forked. Petiole very short or nearly absent; leaf blade ovate or narrowly ovate, 1.5-4 × 1-2 cm, subleathery, both surfaces pubescent or glabrous, midvein prominent abaxially, impressed adaxially, base rounded or subcordate, margin entire, ciliate, slightly revolute, nearly undulate, apex acute; ocrea lax, brown, tubular, 1-2 cm, membranous, slightly oblique, densely pubescent. Inflorescence terminal, paniculate, dense; bracts membranous, pubescent. Pedicel articulate. Perianth white, campanulate, 5-parted; tepals obovate, 2.5-3 mm, unequal. Stamens 8, included; anthers purple. Styles 3, very short; stigmas capitate. Achenes included in persistent perianth, brown, ovoid, sharply trigonous, ca. 3 mm. Fl. Jul-Aug, fr. Sep-Oct.

Grassy slopes, thickets, valleys; 3600-4900 m. Xizang [Afghanistan, N India, Nepal, Pakistan; SW Asia].


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