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Perennial herb, up to 2 m high; graminoid; stems glandular-pubescent, sometimes cobwebby at first, leafy. Leaves oblong in outline, lower narrowed to petiole-like base, upper broad-based, half-clasping, all with spiny rounded basal auricles, margins sinuate-pinnatilobate or pinnatifid, triangular or irregular in outline, coarsely sinuate-dentate or less deeply cut, teeth spine-tipped, margins spinose-ciliate, upper surface harshly glandular-pubescent, lower surface commonly grey-or white-felted, sometimes glandular-pubescent. Capitula many in an open, paniculate compound inflorescence; involucral bracts linear-lanceolate, margins spinose-ciliate, usually glandular on back, sometimes cobwebby as well. Ray florets yellow. Disc florets yellow. Flowering time Dec.-May. Pappus of obtuse scales. Cypselae turbinate, glabrous or nearly so.
Similar to B. erysithales in most respects, but differing in the involucral bracts having smooth, not spinose-ciliate, margins in the upper half, and the pappus scales being acute, not obtuse. There is a tendency too for the leaf lobes to be more acutely triangular than they are in B. erysithales.
