60 JUGLANDACEAE. 



buds, the uppermost sometimes long-stalked; large odd-pinnate 

 leaves with toothed leaflets ; inconspicuous monoecious apetalous 

 flowers in catkins ; and variously winged nut-like fruits. 



1. Buds naked. 2. 



Buds scaly. P. rhoifolia. 



2. Rachis of leaves winged. P. stenoptera. 

 Rachis not winged. P. fraxinifolia. 



CARYA. Hickory. 



Rather large deciduous trees with mostly rough bark; hard 

 finally often reddish or brownish wood with the ducts crowded 

 and large in the spring growth but usually smaller or sparser 

 later in the season, and very fine medullary rays connected by 

 equally heavy cross-lines of wood parenchyma; mostly stout ter- 

 ete twigs ; rather lar^e roundish essentially homogeneous some- 

 times dark pith; alternate low shield-shaped large leaf-scars 

 with 3 more or less confluent groups of bundle-traces ; no stipule 

 scars ; alternate ovoid often superposed rather large buds some- 

 times stalked or developing the first season; large odd-pinnate 

 leaves; small green monoecious apetalous flowers in catkins or 

 small clusters ; and rather large nuts with loose usually de- 

 hiscent husk. (Hicoria). 



1. Bud-scales in pairs, sometimes developing into small leaves : 



lateral buds often stalked. (Pecans and Bitternuts). 2. 

 Bud-scales not in opposite pairs. 3. 



2. Twigs and buds with yellow glands : nut scarcely elongated, 



mamillated, very thin-shelled, very bitter. C. cordiformis. 

 Twigs scarcely glandular : nut longer than thick, rather firm- 

 shelled, not bitter. (Pecan). C. Pecan. 



3. Terminal bud small (scarcely 10 mm. long). (Pignuts). 4. 

 Terminal bud large (usually over 10 mm..). (Hickories). 5. 



4. Leaves glabrate : bark not deeply fissured. C. ovalis. 

 Leaves hairy : bark deeply fissured into squares. C. villosa. 



5. Outer bud-scales falling: not shaggy. (Mocker nut). C. alba. 

 Outer scales persistent, pointed : bark shaggy. 6. 



6. Twigs buff or orange: leaflets 7-9. (King nut). C. 1-aciniosa. 

 Twigs gray or reddish: leaflets usually five. 7. 



