Alnus crispa (Aiton) Pursh. Phen: May-Jun; Jul. Hab: Grassy balds, shrub balds, spruce-fir forests, and rock outcrops at high elevations (1600-1900m) in the Roan Mountain Massif, Mitchell and Avery counties, NC and Carter County, TN. Dist: Greenland to NT south to MA, NY (Adirondacks), n. MI, n. WI, c. MN, SK, and AB; disjunct in montane PA; disjunct on the Roan Mountain massif (Mitchell and Avery counties, NC and Carter County, TN).
Origin/Endemic status: Native
Syn: = G, RAB, W, Hardin (1971a); = Alnus alnobetula ssp. crispa – K4, NY, Chery (2015); = Alnus crispa ssp. crispa – Banaev & Adel’shin (2009); = Alnus viridis ssp. crispa – FNA3, K1, K3, Mi, Mi, NE, Pa, Tn, Furlow (1990); = Alnus viridis var. crispa – C; < Alnus alnobetula – S; > Alnus crispa var. crispa – F; > Alnus mitchelliana – Gray (1842), not validly published