(J. MEXICAN WALNUT CCC. Nuts faintly furrowed, thin shelled.
(J. Californica) CALIFORNIA WALNUT AA. Pith of twigs solid; husk opening by 4 valves; nuts smooth.
2. Genus HICORIA, Raf.
B. Bud scales many, overlapping, leaflets 3 to 9.
C. Buds small, to + inch long; husk of nut thin.
D. Twigs and leaf stalks smooth. (H. glabra) PIGNUT DD. Twigs and leaf stalks silvery pubescent.
(H. villosa) PALE-LEAF HICKORY CC. Buds large, to I inch long, husk of nut thick. D. Bark shaggy; twigs smooth.
E. Branchlets stout, orange red; nuts large, thick shelled. (H. laczniosa) BIG SHELLBARK EE. Branchlets stout, grey; nuts small, usually thick shelled. (H. ovata) LITTLE SHELLBARK EeE. Branchlets slender, reddish; nuts 4-angled, thin shelled.
(H. Carolinae-septentrionalis) SHAGBARK HICKORY DD. Bark not shaggy; twigs
(H. alba) MOCKERNUT BB. Bud scales few, not overlapping; leaflets 7 to 13. C. Nuts elongated.
D. Kernel sweet.
E. Leaves silvery and lustrous beneath; nuts solitary, or few in a cluster; leaflets 7 to I I. (H. myristicaformis) NUTMEG HICKORY EE. Leaves not silvery beneath; nuts 3 to to in cluster; leaflets 13 to 15. (H. Pecan) PECAN DD. Kernel bitter; leaflets 7 to twigs and husks hairy. (H. Texana) BITTER PECAN CC. Nuts not elongated; bitter.
D. Buds yellow; nuts smooth; leaflets 7 to 9.
(H. mimina) BITTERNUT DD. Buds red; nut angled; leaflets 9 to 13.
(H. aquatica) WATER HICKORY