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Your search found 5 taxa.
Manual of Vascular Plants of NE US & Adjacent Canada (Gleason & Cronquist,1991)
Alnus viridis var. crispa
Manual of the Southeastern Flora (Small, 1933)
Male catkin buds sessile, not pendent, per Woody Plants of the Southeastern US: A Winter Guide.
Male catkins longer than female catkins, pendent, each one stalked, per Woody Plants of the Blue Ridge.
Britton & Brown Illus Flora of Northeast US & adjacent Canada (Gleason, 1952)
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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