Conyza

Annual or perennial herbs, rarely shrubs. Leaves alternate, rarely also in basal rosette, entire, toothed or rarely dissected. Capitula disciform or shortly radiate, in few-headed loose corymbs or panicles, rarely subglobosely arranged, rarely solitary. Involucre +/- campanulate; bracts in 2 to many rows, imbricate, linear, usually hairy. Receptacle flat or slightly convex, epaleate, honeycombed, sometimes with margins of pits produced. Marginalflorets female, fertile, usually in many rows; corolla shorter than style, tubular, filiform, truncate or minutely 2-5-lobed or with long or short lamina, white or pink. Discflorets bisexual, fertile or some functionally male, tubular, becoming campanulate above, 5-lobed, yellow or white. Anthers ecalcarate and ecaudate. Style branches of disc florets narrow and flattened, with broadly triangular appendage, with conspicuous sweeping hairs outside or elliptical with minute sweeping hairs. Cypselas small, compressed, smooth or 1-nerved on each face. Pappus of many barbellate bristles in 1 row, rarely in 2 rows, accrescent, +/- concealing flowers. x = 9 (8, 12) (aneuploids, high polyploidy, B-chromosomes).