Compilation
Eupatorium purpureum

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Name

Identification
Eupatorium trifoliatum L. [family ASTERACEAE ] (stored under name); Eupatorium trifoliatum L. [family ASTERACEAE ] Verified by James L. Reveal, Eupatorium purpureum L. [family ASTERACEAE ] Verified by James L. Reveal,
Related name
  • Eupatorium trifoliatum
  • Eupatorium stridens
  • Eupatorium serotinum
  • Eupatorium maculatum
  • Eupatorium purpureum
  • Eupatorium pulchellum
  • Ageratum corymbosum
Common name
  • Sweetscented or sweet joepyeweed, Flora of North America Vol. 21
  • Spotted joepyeweed, Flora of North America Vol. 21
  • Trumpetweed, Flora of North America Vol. 21
  • hollow joepyeweed, Flora of North America Vol. 21
  • eupatoire maculée, Flora of North America Vol. 21

Flora

Entry for Eutrochium maculatum (Linnaeus) E. E. Lamont [family ]
Herbarium
Flora of North America (FNA)
Collection
Flora of North America
Resource Type
Reference Sources
Entry From
Flora of North America, Vol 21,
Names
Eutrochium maculatum (Linnaeus) E. E. Lamont [family ], Sida, 21: 902. 2004
Eupatorium maculatum Linnaeus [family COMPOSITAE], Cent. Pl. I, 27. 1755
Eupatoriadelphus maculatus (Linnaeus) R. M. King & H. Robinson [family COMPOSITAE]
Eupatorium purpureum Linnaeus subsp. maculatum (Linnaeus) Á. Löve & D. Löve [family COMPOSITAE]
Eupatorium purpureum var. maculatum (Linnaeus) Voss [family COMPOSITAE]
Eupatorium trifoliatum Linnaeus var. maculatum (Linnaeus) Farwell [family COMPOSITAE]
Treatment Author(s)
Eric E. Lamont
Information
Plants 60–200 cm. Stems usually purple-spotted, sometimes uniformly purple, usually solid, sometimes hollow near bases, glabrous proximally to densely puberulent throughout, glandular-puberulent distally. Leaves in (3s–)4s–5s(–6s); petioles 5–20 mm, glabrous or pubescent; blades pinnately veined, lance-elliptic to lanceolate or lance-ovate, mostly (6–)8–23(–30) × (1.5–)2–7(–9) cm, bases gradually or abruptly tapered, margins sharply serrate or doubly serrate, abaxial faces gland-dotted and densely pubescent to glabrate, adaxial faces sparingly hairy or glabrous. Heads in flat-topped, corymbiform arrays. Involucres often purplish, 6.5–9 × 3.5–7 mm. Phyllaries glabrous or densely pubescent. Florets (8–)9–20(–22); corollas purplish, 4.5–7.5 mm. Cypselae 3–5 mm. 2n = 20.
Distribution
North America.
Discussion
Eutrochium maculatum has the widest geographic distribution and greatest morphologic variability among species in the genus. The three varieties recognized here show intergradation where the ranges overlap.

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