Corylus cornuta Marshall
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Shrub 1–3 m, the young twigs villous at first; lvs oblong or oblong-obovate, short-acuminate, coarsely and doubly serrate, broadly rounded to subcordate at base, pale green beneath and ± pubescent, especially on the veins and in the vein-axils; catkins sessile or nearly so; involucre 4–7 cm, usually densely bristly below, prolonged beyond the nut into a long, slender beak cut at the summit into narrowly triangular lobes; nut short-ovoid, scarcely compressed, 1–1.5 cm; 2n=22. Moist woods and thickets; Nf. to B.C., s. to N.J., Pa., O., Mo., Oreg., and in the mts. to n. Ga. (C. rostrata)