Herbaceous, probably biennial, up to 1.2 m tall, aromatic, stem forking, often low down, into long virgate branches, glandular-pubescent, loosely and thinly white-woolly at first, persisting on the upper parts, leafy. Leaves mostly 30-80 x 7-20 mm, smaller on the inflorescence branches, reduced near the heads, linear-oblong or oblong, apex acute, base broad, half-clasping, both surfaces glandular-pubescent, margins and sometimes the midline white-woolly. Heads heterogamous, depressed-globose, ±12-14 mm long, (20-)25-30 mm across the radiating bracts, solitary at the tips of long (mostly 50-300 mm) leafy branches corymbose-paniculately arranged. Involucral bracts in ±9 series, graded, imbricate, inner much exceeding the flowers, glossy, bright yellow. Receptacle shortly honeycombed. Flowers ±1000-1400, 100-340 female, 700-1200 homogamous. Achenes 1 mm long, barrel-shaped, glabrous. Pappus bristles many, equalling corolla, tips barbellate, bases with patent cilia, cohering or not.
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