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DescriptionAnnual or biennial herb, up to 1 m tall. Stems stout, bearing rigid hairs which are tuberculate at the base and 3-fid and hooked at the apex. Basal leaves elliptic to oblanceolate, decurrent into a winged petiole; cauline leaves sessile, amplexicaul. Capitula borne in an irregular corymb. Outer phyllaries 3-5, large, ovate-cordate; inner lanceolate. Flowers yellow. Achenes 2.5-3.5 mm; beak slender, as long as the achene.