Asteraceae (tribe Heliantheae) subtribe Flaveriinae
Annuals, perennials, or subshrubs, 10–80 cm (often ± succulent). Leaves cauline; opposite; petiolate or sessile; blades (1- or 3-nerved) oblong, oblong-ovate, lanceolate, linear, or filiform, margins entire or toothed, faces glabrous, glabrescent, or puberulent. Heads radiate or discoid, in glomerules or corymbiform to paniculiform arrays. Calyculi 0 or of 1–2 bractlets. Involucres campanulate, cylindric, obconic, turbinate, or urceolate. Phyllaries persistent, 2–8 in ± 1 series (distinct, linear to oblong, subequal, ± succulent to membranous or scarious). Receptacles flat to convex, epaleate. Ray florets 0, or 1–6, pistillate, fertile; corollas yellow. Disc florets 1–60[–100+], bisexual, fertile; corollas yellow, tubes shorter than or about equaling the funnelform to campanulate throats, lobes 5, deltate; anther thecae pale; stigmatic papillae in 2 lines. Cypselae cylindric to clavate or ± compresssed, linear-oblong to oblanceolate, 10–15-ribbed, glabrous or hairy; pappi 0, or persistent, coroniform, or of 2–5 ovate, scarious scales, or of 20–25+ unequal bristles, or of 5 scales plus 5 bristles (all in 1 series, sometimes connate).
Mostly subtropical, tropical, and warm-temperate New World.
Genera 3, species 27 (3 genera, 10 species in the flora).
As noted by H. Robinson (1981), traditionally, Flaveria and Sartwellia were treated in Helenieae, Haploësthes in Senecioneae.
|1||Disc florets 18–30(–60); pappi of 20–25+ bristles||Haploësthes|
|1||Disc florets 1–15; pappi 0, or coroniform, or wholly or partly of scales||> 2|
|2||Ray florets 3–5; pappi of 5 erose scales alternating with 5 setiform scales or bristles (sometimes all 10 elements basally connate)||Sartwellia|
|2||Ray florets 0 or 1; pappi 0, or coroniform, or of 2–4 hyaline scales||Flaveria|