25. Rheum subacaule Samuelsson, Svensk Bot. Tidskr. 30: 712. 1936.
垂枝大黄 chui zhi da huang
Herbs short, 15-20 cm tall. Roots slender, ca. 1 cm in diam. Stem very short, densely pubescent. Basal leaves 3 or 4; petiole green-purple, subterete, ca. as long as to 1.5 × as long as blade, pilose; leaf blade purple abaxially, dark green adaxially, triangular-cordate or triangular-ovate, 6-10(-12) × 4-7 cm, abaxially yellow hispidulous, adaxially glabrous, basal veins 3-5, middle one stout, base cordate, margin entire, apex acuminate. Stem leaves 1 or 2, small, 3-4 cm; ocrea spreading, 3-4 cm, membranous, glabrous, not clasping. Panicles 2-4 from base, sparsely branched from base, densely hispidulous. Pedicel short, ca. 2 mm, jointed below middle. Flowers 3-5-fascicled. Tepals 6, purple-red, ovate or elliptic, outer 3 smaller, ca. 1.5 mm. Stamens ca. as long as perianth or slightly longer; anthers ellipsoidal. Ovary ellipsoid; stigma inflated. Fruit broadly cordate or cordate, 7.5-8.5 × 8.5-9.5 mm, base retuse; wings purple-red, ca. 2.5-3 mm, broad, with longitudinal vein at middle. Seeds red-brown with a lanceolate black-brown stripe, triangular-ovoid. Fl. Jul, fr. Aug-Sep.
* Hilltops, slopes; 3500-4300 m. W Sichuan.