Eutrochium dubium
Eutrochium steelei
coastal plain joe-pye weed, joepye thoroughwort
steele's eupatorium
usually purple-spotted, sometimes uniformly purple, solid, glabrous proximally, glandular-puberulent distally.
usually greenish purple, sometimes evenly purplish, solid, usually glandular-pubescent throughout, sometimes densely puberulent and sparingly glandular.
mostly in 3s–4s;
petioles 7–25 mm, glabrous;
blades usually ± 3-nerved, rarely pinnately veined, deltate-ovate or ovate to lance-ovate, 5–16 × 2–8 cm, relatively thick and firm (often rugose), bases usually abruptly contracted to petioles, margins coarsely serrate, abaxial faces densely gland-dotted and sparingly hirsute (at least on midribs and main veins), adaxial faces scabrous, glabrescent.
mostly in 3s–4s;
petioles (0.7–)1.3–2.8(–3.6) mm, glabrate to densely ciliate;
blades pinnately veined, lance-ovate or ovate to deltate-ovate, mostly 7–30 × 2.5–18 cm, relatively firm, bases abruptly or gradually tapered, margins sharply serrate, abaxial faces ± glandular-pubescent and sparsely hirsute (at least midribs and main veins), adaxial faces scabrous-hirsute, glabrescent.
often purplish, 6.5–9 × 2.5–5 mm.
often purplish, 6.5–9 × 3.5–5 mm.
(4–)5–9(–10);
corollas usually dark purple, rarely pinkish or white, 4.5–7 mm.
(5–)6–9(–10);
corollas usually pale pinkish or purplish, 4.5–7 mm.
glabrous or sparsely hairy.
mostly glabrous, outer sometimes hairy on midveins.
usually in ± convex, sometimes flat-topped, corymbiform arrays.
in loose, convex, compound corymbiform arrays.
3–4.5 mm.
3–4.5 mm.
= 20.
= 20.
Eutrochium dubium
Eutrochium steelei
Eutrochium dubium is restricted to the coastal plain, and inland along major river systems, of eastern North America. Identification of E. dubium has been difficult for field botanists, as evidenced by misidentified herbarium specimens. The most prominent character distinguishing E. dubium from its relatives (especially E. maculatum) is the 3-nerved leaf venation: the proximalmost pair of lateral veins are more prominent and more prolonged than the others. This character is best observed on abaxial leaf faces.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Eutrochium steelei is known from the Blue Ridge Province of western North Carolina and eastern Tennessee, the Ridge and Valley Province of southwestern Virginia, and the Appalachian Plateaus Province of eastern Kentucky.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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