Check out EDDMapS.org to see where this has been reported.
Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Rosids: Fabids: Fagales
WEAKLEY'S FLORA (11/30/12):
Alnus glutinosa
FAMILY
Betulaceae
SYNONYMOUS WITH
PLANTS NATIONAL DATABASE:
Alnus glutinosa
FAMILY
Betulaceae
SYNONYMOUS WITH Alnus alnus
COMMON NAME:
Black Alder, European Alder
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USDA-NRCS PLANTS Database / Britton, N.L., and A. Brown. 1913 pnd_alal7_001_lvd
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USDA-NRCS PLANTS Database / USDA Wetland flora: Field office illustrated guide pnd_algl2_003_lvd
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Zelimir Borzan, University of Zagreb, Bugwood.org bug_1379012
Month Unknown
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Robert Vidéki, Doronicum Kft., Bugwood.org bug_5398732
Month Unknown
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Leslie J. Mehrhoff, University of Connecticut, Bugwood.org bug_5448631
Month Unknown
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Leslie J. Mehrhoff, University of Connecticut, Bugwood.org bug_5448637
Month Unknown
Male catkins appear in fall; female appear in spring before leaves emerge, per Invasive Plants, Guide to Identification, Impacts and Control.
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Leslie J. Mehrhoff, University of Connecticut, Bugwood.org bug_5448656
Month Unknown
Bark becomes dark gray, scaly, per Woody Plants of the Southeastern US: A Winter Guide.
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Leslie J. Mehrhoff, University of Connecticut, Bugwood.org bug_5448675
Month Unknown
Leaves of native alders tend to have pointed ends, these are rounded, per Invasive Plants, Guide to Identification, Impacts and Control.
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Leslie J. Mehrhoff, University of Connecticut, Bugwood.org bug_5448689
Month Unknown
Sticky ("glutinosa") young twigs & leaves distingush it from native alders, per Invasive Plants, Guide to Identification, Impacts and Control.
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Leslie J. Mehrhoff, University of Connecticut, Bugwood.org bug_5448690
Month Unknown
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T. Davis Sydnor, The Ohio State University, Bugwood.org bug_5495389
Month Unknown
The straight trunk and narrow crown are unlike any native eastern alder, per Woody Plants of the Southeastern US: A Winter Guide.