Brittonia 7: 54. 1950. 1950
Vines (herbaceous or suffrutescent), 50–500+ cm. Stems usually 1, ± twining and climbing. Leaves cauline; alternate; petiolate; blades palmati-pinnately nerved, ovate to lanceolate, margins dentate to denticulate, faces ± villous. Heads radiate [discoid], in ± corymbiform arrays or borne singly. Calyculi of 10–20 bractlets. Involucres hemispheric or campanulate to turbinate or cylindric, [4–]12–20(–25+) mm diam. Phyllaries persistent, [8–]12–26+ in (1–)2 series, erect, distinct, lance-linear to linear, equal or subequal, margins membranous (apices sometimes black). Receptacles flat, foveolate, epaleate. Ray florets 6–15+, pistillate, fertile; corollas orange to ± brick-red. Disc florets [12–]40–80+, bisexual, fertile; corollas orange, tubes longer than campanulate throats, lobes 5, erect to reflexed, lance-ovate to lance-linear; style branches stigmatic in 2 lines, apices with lance-attenuate appendages. Cypselae ± cylindric, weakly ribbed, puberulent; pappi persistent, of 100–120+, white, barbellulate bristles.
Introduced; Mexico, West Indies, Central America, tropical South America.
Species ca. 12 (1 in the flora).