18 
J UGLANDACEAE. 
CaryA. Hickory. 
(Family Juglandaceae). 
Trees: deciduous. Twigs mod- 
erate, terete: pith moderate, an- 
gled, often brown, continuous or 
broken at the nodes. Buds rather 
large, sometimes stalked or super- 
posed, the terminal larger, ovoid 
or oblong, apparently naked or 
with 1 or several exposed scales. 
Leaf-scars alternate, shield-shaped 
or 3-lobed, large, low: bundle- 
traces numerous in 3 or 4 more 
or less definite groups:  stipule- 
sears lacking. 
1. Bud-seales in pairs. 2. 
Bud-scales not opposite. 3. 
2. Yellow-glandular: fruit bitter. 
(1). C. cordiformis. 
Secarcely glandular: fruit sweet. 
(Pecan). (2).°C. Pecan. 
. Terminal bud large (usually over 10 mm.). (Hickories). 4. 
Terminal bud small (scarcely 10 mm.). (Pignuts). 7. 
. Outer btiid-scales falling early. (Mockernut). C. alba. 
Outer scales persistent, pointed. (Shagbarks). 5. 
. Twigs buff or orange: fruit very large. C. laciniosa. 
Twigs gray or red-brown: fruit smaller. 6. 
. Twigs glabrate. (Shagbark). (3): 4 tevata; 
Twigs hairy. (Hairy Shagbark). C. ovata hirsuta. 
. Bark very rough, broken into squares. C. villosa. 
Bark rather smooth or flaking. 8. 
. Husk of fruit not splitting far. (Hastern). C. glabra. 
Husk splitting nearly to base. (Western pignut). C. ovalis. 
