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

33. Rheum przewalskyi Losinskaja, Trudy Bot. Inst. Acad. Nauk SSSR, Ser. 1, Fl. Sist. Vyssh. Rast. 3: 115. 1937.

歧穗大黄 qi sui da huang

Herbs short, stout. Stem absent. Ocreae usually at tip of rhizome, brown, membranous or papery, glabrous. Basal leaves 2-4; petiole purple-red, subterete, 4-10 cm, stout, glabrous or muricate; leaf blade purple-red abaxially, yellow-green adaxially, broadly ovate or rhombic-ovate, 10-20 × 9-17 cm, leathery, abaxially glabrous or papilliferous, adaxially glabrous, basal veins 5-7, base subcordate, margin entire, rarely slightly sinuolate, apex obtuse. Panicles 2 or 3, spiciform; rachis from tip of rhizome, subequal to leaves, 2-4-branched, 5-7 mm in diam. at base, glabrous or sparsely papilliferous. Pedicel ca. 2 mm, jointed below middle. Tepals not spreading, yellow-white, broadly ovate or ovate, outer 3 smaller, ca. 1.2 mm. Stamens subequal to perianth, slightly longer than perianth; filaments connected to disk. Ovary broadly ellipsoid; style reflexed, long; stigma inflated to disk. Fruit broadly ovoid or ovoid, 8.5-10 × 7-8.5 mm, base subcordate, apex obtuse, rarely retuse or slightly raised; wings ca. 3 mm wide, with longitudinal veins near middle. Seeds dark brown, ovoid, ca. 3 mm wide. Fl. Jul, fr. Aug.

* Slopes, forests; 1500-5000 m. Gansu, Qinghai, NW Sichuan.


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