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

32. Rheum rhomboideum Losinskaja, Trudy Bot. Inst. Acad. Nauk SSSR, Ser. 1, Fl. Sist. Vyssh. Rast. 3: 116. 1937.

菱叶大黄 ling ye da huang

Herbs dwarf, procumbent. Roots ca. 5 cm in diam. Stem absent. Petiole of basal leaf shorter than blade, subterete, 2-7 cm, papilliferous or glabrous; leaf blade rhombic or rhombic-elliptic, 10-16 × 8.4-14 cm, nearly leathery, abaxially densely papilliferous, adaxially glabrous, basal veins 5, base cuneate or broadly cuneate, margin entire, apex obtuse or obtusely acute. Panicle spiciform; rachis mostly from apex of rhizome, shorter than leaf, 10-15 cm. Tepals purple-red, narrowly oblong-elliptic, 1.5-2 mm. Stamens subequal to perianth. Fruit broadly cuneate, 5.5-12.5 × 5.5-15 mm, base slightly cordate, apex retuse; wings 3-5 mm wide, with longitudinal veins at middle. Seeds ovoid, 3-5 mm wide. Fl. Jun-Jul, fr. Aug-Sep.

* Slopes, grasslands; 4700-5400 m. C and E Xizang.


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