Roundleaf thoroughwort

Eupatorium rotundifolium, the roundleaf thoroughwort, is a perennial herb in the Asteraceae family native to dry open woods, sandy clearings, and pinelands of the eastern United States. The plant grows fifty centimetres to one and a half metres tall with erect, simple or sparsely branched, finely hairy stems arising from a short stout rhizome. The opposite leaves are sessile to nearly sessile, roughly circular to broadly ovate, three to seven centimetres long, with conspicuously rounded coarsely toothed margins, a heart-shaped to truncate base partly clasping the stem, and a rough texture from short stiff hairs on both surfaces. From late summer into autumn the plant produces broad, flat-topped corymbose inflorescences of small whitish flower heads; each head bears five tubular disc florets and no ray florets, subtended by a slender bell-shaped involucre. The achenes are small, dark, and crowned by a pappus of slender bristles.