Eupatorium odoratum L.
Perennial coarse herbs to 2 m tall; stems terete, striate, crisp-puberulous. Leaves opposite, median ones larger, ovate to subdelotoid, 7-15×3.5-8 cm, apex acute to acuminate, base obtuse to very broadly cuneate or truncate, sometimes decurrent, lower surface glandular punctate, 3-nerved, margins sparsely dentate, sometimes entire apically, petiole 1-2.5 cm long; upper leaves gradually smaller near inflorescence. Inflorescence loose corymbs, heads ca. 10 mm long, 4.5-5 mm wide, peduncle 8-16 mm long, densely pubescent; involucre cylindric, ca. 7 mm long; bracts ca. 30, 3-4 seriate, trinerved, outer ones ovate to ovate oblong, inner ones narrowly oblong, apex acute, base obtuse, sparsely pubescent. Florets ca. 30. Achenes black, ca. 4-4.5 mm long, 5-angular, pubescent on ribs.
KAOHSIUNG: Wanshoushan, Leu 956. PINGTUNG: Liangshan, Peng 13641.
Native of tropical America, escaped and naturalized in Asia; Taiwan, introduced as a medicinal herb and naturalized in the south.