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


(Fraxinus nigra Marsh.)

Black ash



FIELD CHARACTERISTICS: A deciduous tree growing to 25 m. in height. The leaves are opposite and compound. Leaflets number 7-11 and are 5-6.4 cm. long, toothed, and sessile. Leaf scars are nearly circular. Branches are circular, or nearly so, and smooth. The bark is furrowed to scaly. Fruit is a flat samara, winged to the base and blunt on both ends. In flower during April and May.

The circular (or nearly so) branches distinguish F. nigra from the 4-sided branches of blue ash (F. quadrangulata). The nearly circular leaf scars, sessile leaflets, and flat samaras winged to the base of F. nigra distinguish it from the half circle leaf scars, slightly petioled leaflets and wedge-shaped samaras with a flat wing of green ash (F. pennsylvanica).

ECOLOGICAL NOTES: Black ash is typically found in wooded swamps.

SOURCE: Gleason and Cronquist (1991); Petrides (1972); and Swink and Wilhelm (1994).

Previous Section -- VI.A. Hardwood Swamps
Return to Contents
Next Section -- Red Maple (Acer rubrum L.)

Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo logo U.S. Department of the Interior | U.S. Geological Survey
Page Contact Information: Webmaster
Page Last Modified: Saturday, 02-Feb-2013 06:31:38 EST
Sioux Falls, SD [sdww55]