Florida Keys Thoroughwort

Shrubs, 50–200 cm. Stems densely puberulent to pilose (often minutely gland-dotted). Leaves opposite; petioles 2–8 mm; blades ovate to ovate-deltate or ovate-lanceolate, mostly 2–7(–8) × 1–4 cm, bases truncate to cordate, margins entire or shallowly serrate to crenate, apices obtuse, abaxial faces densely gland-dotted, adaxial sparsely puberulent. Involucres 2.8–3 mm. Phyllaries: outermost elliptic-lanceolate, hispidulous-puberulent, margins herbaceous, mostly eciliate. Corollas white or pinkish white, 2.2–2.6 mm, lobes glandular. Cypselae 1.5–1.8 mm, finely hispidulous-strigose.

Eupatorium villosum Swartz, Prodr., 111. 1788