Ambrosia cumanensis Kunth

Ambrosia cumanensis H. B. K. Nov. Gen. & Sp. 4: 276. 1820
Ambrosia maritime! Sieber; Presl. Bot. Bemerk. 106, hyponym. 1844. Not A. maritima L. 1753. Ambrosia paniculata A. Rich, in Sagra, Hist. Cuba 11: 51. 1850. Not A. paniculata Michx. 1803. Ambrosia artemisiifolia trinitensis Griseb. Fl. Brit. W. Ind. 370. 1861. Ambrosia paniculata cumanensis O. Ii. Schulz, Symb. Ant. 7: 86. 1911.
A perennial, often sufTrutieose at the base, with a branched root; stem 5-20 dm. high, hirsute with long soft spreading or reflexed hairs; leaves bipinnatifid, strigose on both sides, paler beneath, long-hirsute on the veins; petioles 2-4 cm. long; leaf-blades triangular-ovate in outline; rachis winged, 2-4 mm. wide; divisions ovate-lanceolate, acute or mucronate; staminate heads numerous, in racemes terminating the branches; peduncles about 2 mm. long; involucre saucer-shaped or slightly broadly obconic, crenate on the margin, 3-4 mm. broad, sparingly hispidulous, sometimes with a few long scattered hairs; paleae of the receptacle filiform; corolla puberulent; pistillate heads in small clusters in the upper axils; fruit obovoid, angled, puberulent and glandular-granuliferous; beak short, about 0.5 mm. long; spines 4-7, short, conic, rather stout.
Type locality: Near Cutnana, Venezuela.
Distribution: Mexico to Colombia, Brazil, and the Lesser Antilles; Cuba.