Asclepias curassavica Linnaeus, 1753

Erect herb, up to 1 m tall, young branches puberulous. Leaves opposite, petiole 1-2 cm long; lamina 5-16x 1-4 cm, lanceolate to linear-lanceolate, tapering at both ends, glabrous or glabrate. Cymes terminal as well as axillary. Pedicels 1-2 cm long, puberulent. Calyx hidden by the reflexed petals, green, lobes 2-3 mm long. Corolla red to orange red, lobes ovate to oblong, 4-7 (-10) mm long, corona segments erect, broadly ovate, obtuse, 4-5 mm long. Follicles 5.5-10 x 7-10 mm, tapering at both ends. Seeds c. 6 mm long, narrowly winged, dark brown, coma white silky.

Subshrub to 1 m tall with milky sap. Stems simple or branched. Leaves opposite, elliptic-lanceolate, to 12 cm long; apex acute to acuminate. Inflorescences of axillary and terminal, pedunculate umbels. Corolla orange-red, rarely yellow or white, the lobes 5-8 mm long, becoming reflexed. Corona hoods orange, each with a needle-like horn 7 mm long. Follicles 5-10 cm, fusiform. Seeds bearing silky hairs, 2-4 cm long.

Rarely grown as an ornamental plant in gardens.

Plants to 1 m tall. Stems pale gray, puberulent to glabrous. Leaves opposite; petiole to 1 cm; leaf blade lanceolate or oblong-lanceolate, 6-15 × 1-4 cm, glabrous or abaxially puberulent along veins, base decurrent into petiole, apex acuminate or acute. Cymes up to as long as leaves, 10-20-flowered; peduncle 3.5-6 cm, pubescent. Pedicel 1.2-2.5 cm, pubescent. Sepals lanceolate, ca. 3 × 1 mm, pubescent. Corolla purple or red, 7-9 mm; lobes oblong, 5-8 × ca. 3 mm, reflexed. Corona lobes yellow or orange, 3.5-4 mm; gynostegium 2.5-3 mm. Follicles fusiform, 5-10 × 1-1.5 cm. Seeds ovate, 6-7 × ca. 3 mm; coma 2-4 cm. Fl. almost all year. 2n = 22.