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A perennial herb up to 1.5 m tall, stems thick, hollow, glandular-pubescent, leafy, branching above into a large, many-headed corymbose panicle. Radical and lower cauline leaves up to 45(-75) cm long including the petiole, 10(-15) cm broad, elliptic in outline, lyrate-pinnatifid, the lobes large, in turn lobed or repand, denticulate, sinuses broad, rounded, both surfaces glandular-pubescent, nerves reticulate below, upper leaves similar but smaller, broad-based and cordate-clasping. Heads discoid, turbinate, c. 8 x 6 mm, very many in congested cymose-corymbose clusters borne in a large open corymbose panicle. Involucral bracts c. 10-12, 6-7 mm long, glandular hispid, calyculus bracts very few. Flowers purple. Achenes cylindric, ribbed, glabrous or rarely minutely hispid between the ribs.
Perennial herb. Stems up to 1.5 m high, hollow, glandular-pubescent, leafy. Leaves up to 750 x 150 mm including petiole, elliptic, lyrate-pinnatifid, lobes large, lobed or repand, denticulate, sinuses broad, both surfaces glandular-pubescent, upper leaves smaller, broad-based and cordate-clasping. Inflorescence a large, corymbose panicle. Capitula many, discoid, purple; involucre turbinate; bracts ± 10-12, 6-7 mm long, glandular-hispid; calyculus bracts very few. Flowering time Oct.-Feb. Cypselae cylindrical, 2 mm long, ribbed, glabrous.
Like S. lanifer but heads crowded in compound corymbs and achenes glabrous and striate.
A herb.
