Eupatorium maculatum L.

• Authority

  Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

• Family

  Asteraceae

• Scientific Name

  Eupatorium maculatum L.

• Description

  Species Description - Stems 6–20 dm, speckled or sometimes more evenly purplish, seldom glaucous; lvs mostly in 4’s or 5’s, lance-elliptic to lanceolate or lance-ovate, relatively gradually narrowed to the short petiole (sometimes more abruptly contracted in ssp. bruneri), 6–20 × 2–9 cm, seldom evidently triplinerved, sharply serrate; infl or its divisions ± flat-topped in life; invol 6.5–9 mm, often purplish, its bracts well imbricate in several series, often 3–5-nerved, obtuse, essentially glabrous, or the outer often ± inconspicuously short-hairy; fls purple to rather pale lavender, (8)9–22 per head; 2n=20. Moist places, especially in calcareous soils; Nf. to B.C., s. to Md., W.Va., Ill., Neb., N.M., and Utah, and along the higher mts. to N.C. and Tenn. July–Sept. Two sspp., one with two vars.

• Common Names

  spotted joe-pye-weed