SUMMER KEY TO THE SPECIES OF CARYA

a.Bark of trunk essentially smooth, not deeply furrowed norshaggy; husk of fruit less than 1/8 inch thick.
b.Leaflets usually 5-7, glabrous beneath; buds dome-shaped,greenish; kernel of nut sweet.
c.Twigs long-hairy; fruit less than 1 inch long.C. microcarpa, p. [75].
cc.Twigs glabrous or nearly so; fruit 1-1/2-2 inches long.C. glabra, p. [77].
bb.Leaflets usually 7-11, more or less downy beneath; budselongated, bright yellow; kernel of nut bitter.C. cordiformis, p. [79].
aa.Bark of trunk deeply furrowed or shaggy; husk of fruitmore than 1/8 inch thick.
b.Twigs more or less pubescent; leaflets 5-7, more or lesspubescent beneath.
c.Twigs brownish; buds densely hairy; fruit 1-1/2-2 incheslong.C. alba, p. [73].
cc.Twigs orange; buds merely puberulous; fruit 1-3/4-2-1/2inches long; (leaflets usually 7).C. laciniosa, p. [71].
bb.Twigs tending to be glabrous; leaflets usually 5, glabrousbeneath.C. ovata, p. [69].

WINTER KEY TO THE SPECIES OF CARYA

a.Bark of trunk essentially smooth, not deeply furrowed norshaggy; husk of fruit less than 1/8 inch thick.
b.Terminal bud narrow, long-pointed, flattish, bright yellow;kernel of nut bitter.C. cordiformis, p. [79].
bb.Terminal bud broad, dome-shaped, not bright yellow;kernel of nut sweet.
c.Buds greenish; twigs glabrous; fruit 1-1/2-2 inches long.C. glabra, p. [77].
cc.Buds red-brown; twigs long-hairy; fruit less than 1 inchlong.C. microcarpa, p. [75].
aa.Bark of trunk deeply furrowed or shaggy; husk of fruitmore than 1/8 inch thick.
b.Twigs more or less pubescent; buds more or less pubescent.
c.Buds 1/2-3/4 inch long, densely hairy; outer bud-scalesdeciduous in autumn; twigs brownish; fruit 1-1/2-2 incheslong.C. alba, p. [73].
cc.Buds about 1 inch long, merely puberulous; outer bud-scalespersistent until spring; twigs orange colored;fruit 1-3/4-2-1/2 inches long.C. laciniosa, p. [71].
bb.Twigs tending to be glabrous; buds glabrous or nearly so.C. ovata, p. [69].

Shagbark Hickory. Shellbark Hickory