Eupatorium adenophorum Spreng.
Perennial coarse herbs to 1.5 m tall; stems often purple, terete, erect, glandular puberulent. Leaves opposite, median ones larger, ovate-deltoid, 7-10 cm long, 4-7 cm wide, apex acuminate, base obtuse to very broadly cuneate or truncate, sparsely pilose on both surfaces, 3-nerved, margins crenate, petiole 4-5 cm long, upper leaves gradually smaller toward inflorescence. Inflorescence of loose compound corymbs, heads ca. 6.5 mm long, 6 mm in diam., peduncle 8-14 mm long, densely pubescent; involucre cylindric, ca. 3-4 mm long; bracts ca. 25, 3 or 4 seriate, outer ones narrowly lanceolate, inner ones narrowly oblong, apex acute, base obtuse, margins membranaceous, ciliate; florets ca. 70-80, white; receptacle glabrous, areolate. Achenes black, 1.5 mm long, 5-angular, glabrous. Pappus of 8-10 bristles, ca. 3.5 mm long.
KAOHSIUNG: Tengchih, Yen 4616. TAITUNG: Litao, Chen 14333.
Native of Mexico, California and the West Indies, widely adventive in tropical areas.