Bidens reptans G.Don

Large, scandent herbs, often clambering in thickets to 3 m high; stems glabrate, fistulose, sometimes stout. Leaves opposite, trifoliolate, the leaflets to 10 cm long, ovate or lanceolate, apically acuminate, basally obtuse, the margins serrate, pinnately veined, sometimes drying reticulate beneath, puberulent on both sides with weak hairs; petioles glabrate or puberulent, slightly expanded and clasping at the base. Inflorescence a racemose-paniculate aggregation of flowers along the ends of the branches; peduncles glabrate or pubescent, slender, to 11 cm long; bracts short, linear-spatulate; linear-spatulate bracteoles sometimes present. Heads radiate, showy, to 4 cm across; involucral bracts in 2 dissimilar series, the outermost narrow, to 6 mm long, expanded basally and apically, imbricate only at the basal expansion, drying 3-nerved, ciliate, sometimes pubescent at the base, the innermost series lanceolate, indurate, the margins hyaline-scarious, apically thickened and tomentose; paleas lanceolate, scarious, apically dark-striate and puberulent; ray florets 4-7, the corolla showy yellow, to 2.5 cm long, the tube 2-3 mm long, flattened, sparsely pilose, the limb narrow, glabrate, drying prominently 10-12-nerved, apically mucronulate or minutely denticulate, the style mostly wanting, the ovary sterile, flat; disc florets numerous, 8-10 mm long, the corolla 5-6 mm long, the tube ca. 1.5 mm long, glabrate, the limb tubular, the lobes glabrous, the anthers black, ca. 3 mm long, the appendages ovate, dark, the base subauriculate, the style branches flattened, ventrally pilose with a thick