Herbs, annual or biennial, 80-150 cm tall; roots fusiform. Stems erect, thick, branched above middle, densely leafy, densely gray-white strigose, sparsely hirsute. Leaves: basal withered at anthesis, lower cauline petiolate, blade oblanceolate or lanceolate, 6-10 × 1-3 cm, surfaces densely strigose, especially abaxially, base attenuate, margin usually coarsely 4-8-serrate per side, apex acute or acuminate, mid and upper reduced, blade narrowly lanceolate to linear, margin serrate or entire. Capitula 5-8 mm in diam., numerous, in large and long paniculiform synflorescences; peduncles 3-5 mm. Involucre campanulate to urceolate, ca. 4 × 3-4 mm; phyllaries 3-seriate, gray-green, linear-lanceolate or linear, abaxially scabrous, apex acuminate, outer short or ca. 1/2 as long as inner, inner ca. 4 mm, margin scarious. Ray florets numerous, 4-4.5 mm, lamina yellowish or purplish, short, filiform, apex 2-denticulate; disk florets 6-11, yellowish, ca. 4 mm, tube sparsely puberulent. Achenes linear-lanceoloid, compressed, 1.2-1.5 mm, strigillose. Pappus white, later yellowish brown. Fl. May-Oct.
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Erect, roughly hairy annual herb up to 2 m tall, stems very leafy, usually simple below, branching above into the compound inflorescence, these lateral branches never overtopping the main axis, the whole forming a pyramidal compound inflorescence. Leaves sessile, up to 10 x 1.5 cm, lanceolate to elliptic, margins entire or toothed. Heads many, usually less than 1 cm across when pressed. Involucral bracts in c. 3 series, lanceolate, acuminate, dark with pale scarious margins, midline with immersed oil sacs, pilose. Achenes c. 1.25 mm long, narrowly elliptic, compressed, thinly hairy, margins thickened. Pappus of straw-coloured scabridulous bristles.
Annual herb, up to 2 m high. Leaves lanceolate to elliptic, margins entire or toothed. Lateral branches never overtopping main axis, the whole forming a pyramidal compound inflorescence. Heads less than 10 mm in diameter, pappus straw-coloured. Flowers greenish white, greenish yellow, yellowish or whitish.
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