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Your search found 5 taxa.
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Common Name:
Green Alder, Mountain Alder
SYNONYMOUS WITH
Manual of Vascular Plants of NE US & Adjacent Canada (Gleason & Cronquist,1991)
Alnus viridis var. crispa
INCLUDED WITHIN
Manual of the Southeastern Flora (Small, 1933)
Alnus alnobetula
Male catkin buds sessile, not pendent, per Woody Plants of the Southeastern US: A Winter Guide.
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Common Name:
Tag Alder, Hazel Alder, Smooth Alder
Male catkins longer than female catkins, pendent, each one stalked, per Woody Plants of the Blue Ridge.
Common Name:
Speckled Alder
SYNONYMOUS WITH
Britton & Brown Illus Flora of Northeast US & adjacent Canada (Gleason, 1952)
Alnus rugosa
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Common Name:
Black Alder, European Alder
SYNONYMOUS WITH
Alnus alnus
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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