Herbs perennial, to 1.5 m tall. Rootstock branched, robust, with many long, slender roots. Stems angular, glabrous. Radical leaves: stipules brown, membranous, abaxially glabrous; petiole glabrous; leaf blade with 7–9 pairs of leaflets; leaflets petiolulate, green on both surfaces, fasciated or fasciated lanceolate, 5–7 × 1.5–1.7 cm, both surfaces glabrous, base subcordate to obliquely truncate or rounded, margin acutely incised serrate, apex rounded to acute; cauline leaves: stipules green, falcate, herbaceous, margin incised serrate; leaf blade resembling that of radical leaves but leaflets fewer and narrower higher up stem. Inflorescences usually nodding, spicate, long cylindric, 2–7 × 0.5–0.8 cm; peduncle subglabrous; bracts lanceolate, shorter than sepals, abaxially and at margin densely hairy. Sepals red, whitish red, or white, long elliptic, abaxially glabrous. Stamens 4; filaments compressed-dilated, 0.5–2 × as long as sepals, apex narrower than or nearly as broad as anther. Ovary glabrous or pubescent near base; stigma dilated, discoidal. Fruiting hypanthium longitudinally 4-ribbed, glabrous. Fl. and fr. Jul–Sep.
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A herb. It keeps growing from year to year. It grows 1.5 m tall. The rootstock is branched and robust with several long slender roots. There are leaves at the base and on the stem. Those at the base have 709 pairs of leaflets and those higher up have less.
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