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Achenes dark-brown to black, 5–6.5 x 1.5–2 mm. including a 1–1.5 mm. long paler-coloured beak, compressed-ellipsoid, broadly thickened at the margins, narrowly 1-ribbed on each face, hispidulous or glabrous; pappus several-seriate, of white barbellate setae c. 6 mm. long.
Phyllaries ciliolate above otherwise glabrous, guttulate, green and often purple-tinged where exposed; the outermost less than half the length of the inner, broadly ovate; the innermost 9–11 x 1–2 mm., linear-lanceolate, margins becoming involute except near the apices.
Capitula numerous, stalked; stalks 1.5–12 mm. long; involucres 8–9 x 1.5–2 mm. at time of flowering, increasing to c. 12 x 2.5 mm. in fruiting capitula, cylindric.
Florets c. 5 per capitulum; corollas yellow, up to c. 12 mm. long, tube narrowly cylindric, sparsely pilose near the throat; ligule c. 6 mm. long, erect.
Synflorescences paniculate, up to c. 40 x 15 cm., cylindrical; branches divaricate slender glabrous.
An erect perennial herb, often viscid, up to c. 150(200) cm. tall; taproot semi-woody turbinate.
Stems solitary, branching above, glabrous, green and often purple-tinged.
