Nicknames: see swollen, willow root, rhubarb, radish.

Perennial herb, 70 ~ 100 cm in height, hairless, thick roots, fleshy, conical and yellow skin. The stems are erect, multi-branched, green or purplish red, with longitudinal grooves. Leaves alternate, ovoid or ovoid,12 ~ 25cm long and 5 ~10cm wide, with acute apex, wedge-shaped base, downward extension, entire margin, pinnate lateral veins and stout main veins; The petiole is1.5 ~ 3cm long, with a groove on it and a semicircular bottom. Racemes are terminal or lateral, and are10 ~15cm long; Flowers bisexual, about 8 mm in diameter, peduncle, with bracts 1 and bracteoles 2 at the base of peduncle; Calyx is usually 5 pieces, even 4 pieces, oval or oblong, white first, then reddish: no petals: 8 stamens, anthers pale pink (a few become lavender); Carpels 8 ~ 10, free. Berries are oblate, about 7 mm in diameter, usually composed of 8 mericarps, and purple-black when ripe. The seed kidney is round, flat and black. The flowering period is from June to August. Fruit-bearing period: August ~ 65438+ 10.

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