Flaveria Juss.

Undershrubs or herbs, annual or perennial; stems purplish, few to many, erect, or decumbent, glaucous, glabrous to densely short pubescent or tufted-pubescent in the axils. Leaves opposite, decussate, linear-lanceolate, oblong-ovate or elliptic to oblanceolate, entire, serrate-dentate or spinulose serrate, connate to connate-perfoliate, glabrous or short-pubescent, petiolate or sessile. Heads radiate or discoid, tightly or loosely aggregated on short peduncles in usually flat-topped corymbose panicles or glomerule-like structures in oils. Receptacles small, convex, naked or setose. Ray florets presentt 1 - 2, female, fertile; corolla yellow, oblong, ovate or elliptic, usually rather small and inconspicuous. Disc florets 1-15; corolla yellow, tubular; tube glabrous or minutely pubesceat, 5-lobed. Style linear-oblong, flattened, obtuse and minutely pubescent at the apices. Anthers with conic appendages. Achenes black, 10-ribbed, somewhat flattened, glabrous, those of ray florets usually larger, narrowly oblanceolate or linear-oblong. Pappus mostly absent.

Native of N. America, widely naturalised in many parts of the world. ca 21 species, 2 in India.

Literature. POWELL, A.M. (1978). Systematics of Flaveria (Flavariinae-Asteraceae). Ann. Miss. Bot. Gard. 65(2): 590-636.

KEY TO THE SPECIES

1a. Receptacle of glomerule setose

2. Flaveria trinervia

b. Receptacle of glomerule naked

1. Flaveria bidentis

List of Lower Taxa