USGS - science for a changing world

Northern Prairie Wildlife Research Center

  Home About NPWRC Our Science Staff Employment Contacts Common Questions About the Site

Wetland Plants and Plant Communities of Minnesota and Wisconsin

JOE-PYE WEED

(Eupatorium maculatum L.)


Joe-pye weed

ASTER FAMILY (Compositae or Asteraceae)

IND. STATUS: OBL

FIELD CHARACTERISTICS: A tall, perennial herb 60-200 cm. high with one to several stems. Leaves are in whorls of 4's and 5's around a purple-spotted stem. The lance-shaped leaves are narrowed to the leaf stalk, serrate, and seldom triple-nerved. Stems are usually not covered with a white waxy bloom. The flattish inflorescence lacks ray flowers. Between 9-22 pink to purple disc flowers occur in each head. Flowers bloom from July through September.

A related, equally common species is boneset (E. perfoliatum), which has white flowers and opposite leaves joined around the stem (perfoliate).

ECOLOGICAL NOTES: Joe-pye weed is a very common composite of sedge meadows and shrub-carrs, particularly on calcareous wet soils. It is also present in fresh (wet) meadows, calcareous fens, and shallow marshes.

SOURCE: Gleason and Cronquist (1991); and Swink and Wilhelm (1994).


Previous Section -- Green Bulrush (Scirpus atrovirens Willd.)
Return to Contents
Next Section -- Boneset (Eupatorium perfoliatum L.)

Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo USA.gov logo U.S. Department of the Interior | U.S. Geological Survey
URL: http://www.npwrc.usgs.gov/resource/plants/mnplant/euma.htm
Page Contact Information: Webmaster
Page Last Modified: Saturday, 02-Feb-2013 06:31:30 EST
Sioux Falls, SD [sdww55]