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Common Name:
GREEN ASH, RED ASH
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Coefficient of Conservatism:
2
Coefficient of Wetness:
-3
Wetness Index:
FACW
Physiognomy:
Nt Tree
B. S. Walters
Swamps and shores, often in areas that are quite wet, at least seasonally, often dominant on floodplains, occasionally invading peatlands, also in upland deciduous forests and old fields.
Plants with leaves and new twigs glabrous have been called green ash, but are not now considered of sufficient taxonomic significance to warrant recognition as a variety or subspecies. Pubescent plants (red ash) are rather easily recognized, but glabrous ones may sometimes be confused with F. americana, especially when one does not have sufficient magnification to see the papillose lower surface of the leaflets in the latter. The distinctive slender petiolules in F. americana usually contrast well with the very short petiolules in F. pennsylvanica, in which furthermore they are often narrowly winged so as to give the leaflets an almost sessile aspect. The leaflets may be paler green beneath than above, but are only very rarely as whitish as in typical F. americana. Waxy flakes or strips peeling from year-old twigs of F. americana contrast with the usually smooth (if not pubescent) twigs of F. pennsylvanica. Natural hybrids between these two species are apparently very rare.
Locations
Alcona County
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Alger County
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Allegan County
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Alpena County
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Arenac County
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Including Charity Island
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Baraga County
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Bay County
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Benzie County
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Berrien County
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Cass County
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Charlevoix County
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Including Beaver Island
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Cheboygan County
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Chippewa County
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Including Drummond Island
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Clare County
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Clinton County
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Delta County
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Eaton County
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Emmet County
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Genesee County
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Gladwin County
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Gogebic County
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Gratiot County
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Hillsdale County
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Houghton County
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Huron County
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Ingham County
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Iosco County
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Isabella County
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Jackson County
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Kalamazoo County
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Kent County
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Keweenaw County
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Lake County
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Lapeer County
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Leelanau County
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Including Fox Islands
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Lenawee County
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Livingston County
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Luce County
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Mackinac County
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Including Bois Blanc, Mackinac, Round Islands
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Macomb County
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Manistee County
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Marquette County
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Mason County
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Menominee County
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Midland County
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Missaukee County
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Monroe County
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Montcalm County
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Montmorency County
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Muskegon County
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Newaygo County
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Oakland County
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Oceana County
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Ontonagon County
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Osceola County
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Oscoda County
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Ottawa County
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Presque Isle County
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Roscommon County
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Saginaw County
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Sanilac County
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Schoolcraft County
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Shiawassee County
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St. Clair County
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St. Joseph County
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Tuscola County
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Van Buren County
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Washtenaw County
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Wayne County
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Wexford County
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Citation:
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. January 30, 2023. https://michiganflora.net/species.aspx?id=1734.