APETALOUS EXOGENOUS PLANTS. 499 



♦ Epicarp very thick, i-valved ; seed thick, edible. 



C. ALBA, Nutt. {Shellbarh Ilichory.) Leaflets 5-7 

 (mostly 5), lanceolate-oblong, or the upper ones obovate- 

 oblong, acuminate, pubescent beneath ;/rMiY depressed-glo- 

 bose; mit roundish, thin-shelled, compressed, 4-angled, 

 slightly pointed. Rich woods. March and April. A large 

 treef with shaggy and scaly bark. 



C. SULCATA, Nutt. Leaflets 7-9, obovate-oblong, acumi- 

 nate, pubescent beneath ; /nriY oval, 4-angled above; met 

 oblong, thick-shelled, conspicuously pointed, slightly com- 

 pressed. Eich woods. March and April. — A large tree, 

 with scaly bark. 



C. OLiViEFORMis, Nutt. {Pecau-mit.) Leaflets 13-15, 

 lanceolate-oblong, serrate falcate, acuminate; nut olive- 

 shaped, smooth, thin-shelled, somewhat 4-angled. River- 

 bottoms. — A large tree, with smoothish bark. 



** Epicarp partly ifvalved ; seed thin; bark not scaly. 



C. TOMENTOSA, Nutt. {Hiclcory.) Leaflets 7-9 (mostly 

 7), large, oblong-obovate, acute, pubescent beneath ; sterile 

 aments tomentose ; /r?«^Y large, globose; epicarp thick, 

 coriaceous, parted nearly to the base ; nut thick-shelled, 

 oval, somewhat 6-angled. Rich soil. March and April. — 

 A large tree, with rough bark. 



C. GLABRA, Torr. {Pignut.) Leaflets 5-7 (mostly 7), 

 ovate-lanceolate, acuminate, smooth ; fruit obovate, obcor- 

 date, or pear-shaped ; epicarp thin, parted to the middle, 

 coriaceous ; nut thick-shelled, sometimes angled. (C. por- 

 cina, Nutt.) Woods. March and April. — A large tree, 

 with smoothish bark. 



C. MiCROCARPA, Nutt. Leaflets 5-7, oblong-lanceolate, 

 smooth, glandular beneath, acuminate ; aments smooth ; 

 fruit roundish; epicarp thin; nut thin-shelled, slightly 

 4-angled. April and May. — A large tree; fruit f in di- 

 ameter. 



