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Perennial herb, 1-2 m high; robust; stem single, erect, stout, shortly branched above, leafy, coarsely pilose-araneose. Leaves sessile, elliptic-oblong in outline, pinnatilobed, upper surface thinly araneose with scattered pilose hairs, becoming scabridulous when dry, lower surface whitish or greyish felted-tomentose. Capitula radiate, many, 2-several clustered at ends of short branches; involucral bracts with outer and inner ones thinly araneose; outer leaf-like, ovate-lanceolate and dentate to somewhat lobed with spine-tipped teeth. Receptacle: alveolate, margins extended into bristles. Ray florets yellow, shallowly 4-lobed at apex. Disc floret yellow, lobes glandular-tuberculate at apex. Flowering time Nov.-Jan. Pappus of uniseriate scales, connate at base, oblong. Cypselae narrowly turbinate, 4-or 5-angular, tapering and grooved to base, glabrous.
Leaves sessile, 7–16(20) x 3–6(10) cm., elliptic-oblong in outline, pinnatilobed; leaf and lobe apices strongly spine-tipped; margins entire or ± dentate, spinescent; bases semi-amplexicaul with coarsely-dentate spiny auricles, or the lower leaves narrowed to petiole-like bases, not decurrent; lobes mostly 3–6 on each side, ± spaced, triangular and entire or somewhat rounded or irregular in outline and coarsely dentate, the teeth aristate-spinose with spines to c. 6 mm. long; leaf upper surface thinly araneose with scattered pilose hairs, becoming scabridulous when dry, the lower surface whitish or greyish felted-tomentose.
Phyllaries mostly 14–22 x 4–8 mm., the outer and inner somewhat shorter, thinly araneose; the outer ± leaf-like, ovate-lanceolate and dentate to somewhat lobed with spine-tipped teeth, spines 2–4 mm. long and usually with a second patent spine at the base (phyllary spines paired), ciliate-spinescent between the spine-tipped teeth, succeeding inner phyllaries becoming linear-lanceolate with smaller spines.
Disk-floret corollas yellow, 8–10 mm. long, lobes glandular-tuberculate at the apex; achenes 2–3 mm. long, very narrowly turbinate, 4–5-angular, tapering and ± grooved to the base, glabrous; pappus scales 1-seriate, ± connate at the base, c. 1 mm. long, oblong.
Perennial herb, up to 2 m high. Stems not winged. Leaves mostly cauline, margins sinuate-pinnatilobate or pinnatifid, lower surface grey-or white-felted, sometimes merely glandular-pubescent. Heads radiate. Involucral bracts 5-7 mm broad. Flowers yellow.
Very like B. erysithales, but distinguished primarily by the outer involucral bracts being 5-7 mm broad, not 1-2(-3) mm broad as in B. erysithales. However, there is no clear cut discontinuity in the width of the involucral bracts.
Capitula radiate, numerous, 2-several clustered at the ends of short branches, radiate, c. 5–7 cm. in diam. across the expanded rays.
Stem single erect stout shortly-branched above, leafy, coarsely pilose-araneose.
Rays yellow, mostly 10–20 x 2–5 mm., shallowly 4-lobed at the apex.
Receptacle alveolae margins extended into bristles 1–2 mm. long.
A robust perennial herb 1–2 m. tall.
