Corylus cornuta Marshall var. cornuta . Phen: Feb-Apr; Aug-Oct. Hab: Dry rocky woodlands, thickets, high elevation forests and openings, seepage swamps. Dist: The species ranges from NL (Newfoundland) west to BC, south to NJ, n. GA, e. TN (Chester, Wofford, & Kral 1997), OH, MO, CO, and CA.
Origin/Endemic status: Native
Taxonomy Comments: Var. cornuta occupies most of that range; var. californica (A.L.P.P. de Candolle) Sharp [ssp. californica (A.L.P.P. de Candolle) E. Murray], a small tree, is far western and grades into var. cornuta.
Synonymy: = K1, K3, K4, Va, Furlow (1990); = Corylus cornuta Marshall ssp. cornuta – FNA3, NE, NY; < Corylus cornuta Marshall – C, F, G, GrPl, Il, Mi, Pa, RAB, S, Tn, W, WV, Hardin (1971a)