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

2. Eutrochium maculatum (Linnaeus) E. E. Lamont, Sida. 21: 902. 2004.

Spotted joepyeweed, eupatoire maculée

Eupatorium maculatum Linnaeus, Cent. Pl. I, 27. 1755; Eupatoriadelphus maculatus (Linnaeus) R. M. King & H. Robinson; Eupatorium purpureum Linnaeus subsp. maculatum (Linnaeus) Á. Löve & D. Löve; E. purpureum var. maculatum (Linnaeus) Voss; E. trifoliatum Linnaeus var. maculatum (Linnaeus) Farwell

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.

Varieties 3 (3 in the flora): North America.

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.

1 Stems densely puberulent throughout; leaves densely pubescent on abaxial faces, relatively thick; mostly w of Mississippi River   2c Eutrochium maculatum var. bruneri
+ Stems glabrous proximally, puberulent among heads; leaves usually glabrate (seldom strongly puberulent) on abaxial faces, relatively thin; mostly e of Mississippi River   (2)
2 (1) Distalmost whorls of leaves subtending heads equaling or surpassing arrays of heads; maritime Canada, adjacent New England to ne Minnesota, n Michigan, and s Ontario   2b Eutrochium maculatum var. foliosum
+ Distalmost whorls of leaves subtending heads not equaling arrays of heads; Newfoundland to sw Ontario, s to n and w New England, Pennsylvania, North Carolina, Ohio, Indiana, Illinois, and Iowa   2a Eutrochium maculatum var. maculatum


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