Herbs, perennial, 30-150 cm tall. Rhizome short, with numerous fibrous roots. Stems erect, red or purplish red in lower and median parts, often branched from base or simple, or with corymbose synflorescence branches, only densely white villous or shortly pubescent. Lower stem leaves shed by anthesis; median stem leaves elliptic-lanceolate or linear-lanceolate, 3-12 × 0.5-3 cm, simple or 3-sect, thick, both surfaces scabrid, long or shortly white scabrous, densely so adaxially and on veins, abaxially with yellow glands or eglandular, basally 3-veined, base cuneate, apex acute; upper leaves gradually smaller upward, homomorphic with median stem leaves; all stem leaves basally 3-veined, margin deeply or shallowly dentate, sessile or subsessile. Capitula numerous in apical dense corymb; synflorescence 2.5-6 cm in diam., or large compound corymbs ca. 20 cm in diam.; synflorescence and peduncles purple-red or green, densely shortly white pubescent. Involucre campanulate, 5-flowered; phyllaries 3-seriate, imbricate; outer phyllaries short, lanceolate or broadly lanceolate, 1-2 mm; median and inner phyllaries longer, elliptic or elliptic-lanceolate, 5-6 mm; all phyllaries green or purple-reddish, acute; corollas white, pink, or purplish red, ca. 4.5 mm, with sparse yellow glands. Achenes black-brown, elliptic, ca. 3 mm, 5-ribbed; pappus white, equal to or rather longer than corollas. Fl. and fr. May-Dec. 2n = 20, 30, 40.
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Rhizomatous perennial to 1.5 m high. Stems single, branched distally, puberulent. Leaves opposite, sessile to shortly petiolate (petiole to 2 mm long), lanceolate to narrowly lanceolate, 40–100 mm long, 5–30 mm wide, cuneate to lanceolate at base, serrate, sometimes with 2–5 small lateral lobes near base, or 3–5-digitate, acute. Corymbs to 10 cm wide. Capitula 4–5 mm long; involucral bracts c. 10 in 2 series. Florets pink to purple. Achenes 2–3 mm long, 5-ribbed black. Pappus bristles 20–30, 3–5 mm long, scabrid.
Shaded wet places in valleys, wet places in forests or grasslands; at elevations from 200-2,600 metres. Wet grassy places in lowland and low mountains all over Japan. Swamps or borders of water courses.
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Growing in wet, boggy, peaty soil, on granite, in a wet meadow/Sphagnum bog, and beside a small stream with Gleichenia, Empodisma and Leptospermum polygalifolium at c. 960 m alt.
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