Eutrochium purpureum
purple joe-pye weed, sweet joepyeweed, sweetscented joe pye weed
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.
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.
often purplish, 6.5–9 × 2.5–5 mm.
(4–)5–7(–8);
corollas usually pale pinkish or purplish, 4.5–7 mm.
usually glabrous, sometimes sparsely hairy.
in loose, convex, compound corymbiform arrays.
3–4.5 mm.
Eutrochium purpureum
Varieties 2 (2 in the flora).
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.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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 | var. purpureum |
1. Leaves: abaxial faces densely and persistently puberulent to villous; s Minnesota, Iowa, and ne Kansas to s Wisconsin, n Illinois, and n Missouri | var. holzingeri |
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