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Your search found 17 taxa.
Manual of Vascular Plants of NE US & Adjacent Canada (Gleason & Cronquist,1991)
Alnus viridis var. crispa
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.
Male catkins sessile and dangling, on 1-year-old lateral twigs, per Forest Plants of the Southeast and Their Wildlife Uses.
Catkin buds distinctly stalked, per Woody Plants of the Blue Ridge.
Pistillate flowers in erect catkins about 3/4" long, per Native Trees of the Southeast, An Identification Guide.
Flowers tiny, staminate in drooping catkins near tip of twigs, per Native Trees of the Southeast, An Identification Guide.
Staminate catkins elongate and drooping, pistillate cylindrical and upright, per Native Trees of the Southeast, An Identification Guide.
Male flowers in dense drooping cylindrical catkins 3-4cm long, per Trees of the Southeastern United States.
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