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Heads disciform, whitish (in ours) or dull yellow; invol a single series of narrow, equal, ± herbaceous bracts, sometimes with a few bracteoles at base; receptacle flat, naked; outer fls pistillate, filiform-tubular, eligulate, in 2–several series; inner fls perfect but sometimes sterile, the cor narrowly tubular, 4–5-toothed; style-branches flattened, truncate or with a very short hairy appendage; achenes 5-angled or 10–20-nerved; pappus of numerous slender bristles; erect herbs with alternate, entire to pinnately dissected lvs and cylindric to ovoid heads. 12, N. and S. Amer. and Australia.
Annual or perennial herbs. Lvs simple, subentire to 1-pinnatifid, alternate. Capitula in panicles; involucral bracts in 1 row, with supplementary bracts subtending involucre. Receptacle ± flat; scales 0. Outer florets ♀, not ligulate, filiform; inner florets ☿. Achenes all similar, ± cylindric, with c. 10 prominent ribs, and short antrorse hairs between ribs; pappus simple, sometimes caducous.
Annual or perennial herbs. Leaves sessile, pinnately veined. Capitula disciform, pedunculate, calyculate; involucral bracts free. Florets: corolla limbs greenish white or pinkish; anthers not known; style branches recurved, with a short conical apical appendage. Achenes obloid-ellipsoid. Pappus caducous.
