Home
Heads mostly radiate, the rays pistillate or neutral, mostly yellow, cuneate, 3-lobed, not very numerous; invol bracts in 2–3 series, subequal or the inner shorter, ± herbaceous, generally soon deflexed, the outer sometimes joined at the base; receptacle convex to ovoid or conic, naked; disk-fls very numerous, perfect, the cor-lobes glandular-hairy; style branches flattened, with ventromarginal stigmatic lines and dilated, subtruncate, penicillate tip; achenes 4–5-angled, with as many intermediate ribs, pubescent on the angles and ribs, or glabrous; pappus of 5–10 scarious or hyaline, often awn-tipped scales; herbs with alternate, glandular-punctate, usually decurrent lvs and solitary to numerous heads. 40, New World.
Annual or perennial herbs. Lvs alternate, simple, entire or serrate, often decurrent. Capitula pedunculate, solitary or in loose cymes. Involucral bracts in 2-3 rows, foliaceous or membranous. Receptacle convex, ovoid, or conic; scales 0. Outer florets usually ♀, sometimes sterile, ligulate, usually yellow. Inner florets ☿, tubular, sometimes all florets tubular and ligules 0. Achenes all similar, not compressed, 4-5-angled, narrowed to base, ribbed, often hairy on ribs and angles; pappus of 5-10, often aristate and laciniate scales.
