Eutrochium purpureum |
Eutrochium purpureum var. purpureum |
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purple joe-pye weed, sweet joepyeweed, sweetscented joe pye weed |
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Habit | 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. |
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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. |
petioles glabrous; abaxial faces usually glabrous, sometimes sparsely to densely hairy along major veins (hairs fine, simple, 1-cellular). |
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Involucres | often purplish, 6.5–9 × 2.5–5 mm. |
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Florets | (4–)5–7(–8); corollas usually pale pinkish or purplish, 4.5–7 mm. |
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Phyllaries | usually glabrous, sometimes sparsely hairy. |
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Heads | in loose, convex, compound corymbiform arrays. |
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Cypselae | 3–4.5 mm. |
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2n | = 20. |
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Eutrochium purpureum |
Eutrochium purpureum var. purpureum |
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Phenology | Flowering late summer–early fall. | |||||
Habitat | Rich, open deciduous woodlands, woodland borders, and thickets, wooded ravines, near bases of slopes bordering wet grounds, partial or deep shade | |||||
Elevation | 10–1200 m (0–3900 ft) | |||||
Distribution |
AL; AR; CT; DE; FL; GA; IA; IL; IN; KS; KY; LA; MA; MD; MI; MN; MO; MS; NC; NE; NH; NJ; NY; OH; OK; PA; RI; SC; TN; VA; VT; WI; WV; ON
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AL; AR; CT; DE; FL; GA; IA; IL; IN; KS; KY; LA; MA; MD; MI; MN; MO; MS; NC; NE; NH; NJ; NY; OH; OK; PA; RI; SC; TN; VA; VT; WI; WV; ON |
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Discussion | 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.) |
East of the Mississippi River, abaxial leaf faces of var. purpureum tend to be glabrous and rarely pubescent along the major veins. West of the Mississippi (and in the xeric sandhills of South Carolina), abaxial leaf faces are commonly densely pubescent along the major veins. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 21, p. 477. | FNA vol. 21, p. 477. | ||||
Parent taxa | Asteraceae > tribe Eupatorieae > Eutrochium | Asteraceae > tribe Eupatorieae > Eutrochium > Eutrochium purpureum | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | Eupatorium purpureum, Eupatoriadelphus purpureus | Eupatorium amoenum, Eupatorium falcatum, Eupatorium fuscorubrum, Eupatorium harnedii, Eupatorium purpureum var. album, Eupatorium purpureum var. amoenum, Eupatorium purpureum var. falcatum, Eupatorium purpureum var. ovatum, Eupatorium purpureum var. verticillatum, Eupatorium trifoliatum, Eupatorium trifoliatum var. amoenum | ||||
Name authority | (Linnaeus) E. E. Lamont: Sida 21: 902. (2004) | unknown | ||||
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