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FNA | Family List | FNA Vol. 21 | Asteraceae | Eutrochium

4. Eutrochium purpureum (Linnaeus) E. E. Lamont, Sida. 21: 902. 2004.

Sweetscented or sweet joepyeweed

Eupatorium purpureum Linnaeus, Sp. Pl. 2: 838. 1753; Eupatoriadelphus purpureus (Linnaeus) R. M. King & H. Robinson

Plants 30–200 cm. Stems usually dark purple at nodes, usually otherwise greenish, rarely purplish green, usually solid, rarely ± hollow near bases, glabrous proximally, ± glandular-puberulent distally and among heads. Leaves mostly in 3s–4s(–5s); petioles 5–15(–20) mm, glabrous or sparingly puberulent, rarely ciliate; blades pinnately veined, lance-ovate or ovate to deltate-ovate, mostly (7–)9–26(–30) × (2.5–)3–15(–18) cm, bases abruptly or gradually tapered, margins coarsely serrate, abaxial faces sparingly and minutely gland-dotted and densely pubescent to glabrate, adaxial faces sparingly puberulent and glabrescent or glabrous. Heads in loose, convex, compound corymbiform arrays. Involucres often purplish, 6.5–9 × 2.5–5 mm. Phyllaries usually glabrous, sometimes sparsely hairy. Florets (4–)5–7(–8); corollas usually pale pinkish or purplish, 4.5–7 mm. Cypselae 3–4.5 mm.

Varieties 2 (2 in the flora): North America.

Eutrochium purpureum is morphologically variable and is known to hybridize with all other species in the genus (E. E. Lamont 1995). Historically, more than a dozen infraspecific taxa have been recognized; the extent of intergradation and the lack of correlation among varying traits tend to make recognition of more than two varieties impractical.

1 Leaves: abaxial faces usually glabrous, sometimes sparsely to densely hairy along major veins (hairs fine, simple, 1-cellular); s New Hampshire to n Florida, w to se Minnesota, Iowa, and e Oklahoma   4a Eutrochium purpureum var. purpureum
+ Leaves: abaxial faces densely and persistently puberulent to villous; s Minnesota, Iowa, and ne Kansas to s Wisconsin, n Illinois, and n Missouri   4b Eutrochium purpureum var. holzingeri


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