67. JUGLANDACEAE 151 



3. Bud-scalcs muslard-yi'llow, 4 or 6, valvate (in pairs); lateral 

 leaflets somewhat falcate; fruit nearly globose, 2.5-3.5 cm in 

 diameter, the husk thin, the nut angled, thin-shelled, the seed 

 becoming very bitter; bark of trunk gray, close, scaly or fis- 

 sured; woods, common throughout 111. May- June. Yellow- 

 bud Hickory, iiitternut Hickory. [C. amara Nutt.; Hicoria 



minima (Marsh.) Britt.] C. cordiformis (Wang.) K.Koch 



3. Buds not yellow; bud-scales 6-10, imbricated. 



4. Buds large, pubescent, nearly or quite glandless, the teiTninal 

 one 1-2.5 cm long; twigs stout, grayish; fruits globose or 

 subglobose, 3-7 cm in diameter, the dry husk 4-10 mm 

 thick; seed edible, of good flavor. (Hickories.) 

 5. Leaflets usually 7; nut thick-shelled (2 mm). 



6. Leaf-rachis copiously stellate-pubescent; 1 -year-old twigs 

 pubescent; bark of old trunks tight, gray, with irregu- 

 lar shallow fissures; nut subglobose, 2.5-3.5 cm long, 

 rounded at base, short-pointed at apex; upland woods 

 nearly throughout 111., except the n.w. counties. 

 Mocker-nut. Bigbud Hickory. [C. alba (L.) K.Koch, 



non Nutt.] C. lomentosa (Poir. ) Nutt. 



6. Rachis of mature leaves and 1 -year-old twigs glabrous or 

 puberulent; bark on old trees separating into long 

 shaggy strips; nut generally somewhat compressed, 4- 

 6 cm long, often ellipsoid, pointed at each end; moist 

 rich woods and river-bottoms, local; extending north- 

 ward to Henderson, Peoria, and Champaign counties. 



Apr.-May. Shellbark Hickory 



C. laciniosa (Michx.f) Loud. 



5. Leaflets usually 5; rachis pubescent to glabrous; bark 

 shaggy on old trunks; nut 2-3 cm long, subglobose, com- 

 pressed, angular, pointed, the shell thin (1 mm) ; woods, 

 common. Apr.-June. Shagbark Hickory. [C. alba Nutt.] 



;. C. ovata (Mill.) K.Koch 



4. Buds small, 5-10 mm long; twigs slender, reddish-brown, 



glabrous; dry husk of fruit 1-3 mm thick; bark tight, brown 



or dark gray, scaly or fissured, not shaggy. (Pignuts.) 



7. Leaflets usually 7 ; fruits covered with minute yellowish 



glands, the husk freely splitting to the base. 



8. Bud-scales copiously glandular-dotted; leaf-rachis and 



lower surface of leaflets pubescent and glandular; 



fruits ellipsoid, 3.5-4 cm long; upland woods in the 



southern two-thirds of 111. Black Hickory. [C. buck- 



leyi Durand; H. villosa (Sarg.) Ashe; C. arkansana 



Sarg.] C. texana Buckl. 



8. Bud-scales puberulent, or the outer ones glabrous, not 

 copiously glandular-dotted; mature leaves glabrous or 

 nearly so; fruits subglobose, 2.5-3 cm in diameter; 

 woods, central and southern 111., extending northward 



