JUGLANDACE^E. ( WALNUT FAMILY.) 419 



* * Eplcarp partly 4-valved: seed thin : bark not scaly. 



4. C. tomentosa, Nutt. (HICKORY.) Leaflets 7-9 (mostly 7), large, 

 oblong-obovate, acute, pubescent beneath ; sterile aments tomentose ; fruit large, 

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

 oval, somewhat 6-angled. Rich soil, Florida, and northward. March and 

 April. A large tree with rough bark. 



5. C. glabra, Torr. (PIG-NUT.) Leaflets 5-7 (mostly 7), ovate-lanceo- 

 late, acuminate, smooth ; fruit obovate, obcordate,, or pear-shaped ; epicarp thin, 

 parted to the middle, coriaceous ; nut thick-shelled, sometimes angled. (C. por- 

 cina, Nutt.) Woods, Florida, and northward. March and April. A large 

 tree with smoothish bark. 



6. C. microcarpa, Nutt. Leaflets 5-7, oblong-lanceolate, smooth, glan- 

 dular beneath, acuminate ; aments smooth ; fruit roundish ; epicarp thin ; nut 

 thin-shelled, slightly 4-angled. Mountains of North Carolina, and northward. 

 April and May. A large tree. Fruit f ' in diameter. 



7. C. myristicseformis, Michx. " Leaflets 5, ovate-lanceolate, acumi- 

 nate, smooth, the terminal one sessile ; fruit oval, rugose, rough ; nut oval, 

 slightly acuminate, furrowed, very hard." South Carolina, at Goose Creek, 

 Michaux. 'Berkeley District, Ravenel. Nuts resembling nutmegs. 



8. C. amara, Nutt. (BITTER-NUT.) Leaflets 9-11, oblong-lanceolate, 

 acute, smoothish ; fruit globular ; epicarp thin, parted to the middle ; nut thin- 

 shelled, obcordate ; seed much wrinkled. Low ground, Florida, and north- 

 ward. March and April. A tree of moderate dimensions, with smooth bark, 

 and very bitter and astringent seeds. 



9. C. aquatica, Nutt. Leaflets 9 - 13, lanceolate, acuminate, slightly ser- 

 rate, smooth ; fruit roundish, 4-ribbed ; epicarp thin, 4-parted to the base ; nut 

 compressed, thin-shelled, 4-angled ; seed much wrinkled. River-swamps, Flor- 

 ida to South Carolina. March and April. A small tree with rough bark. 

 Seeds very bitter and astringent. 



2. JUGLANS, L. WALNUT. BUTTERNUT. 



Sterile aments lateral, solitary. Calyx 5-6-parted. Stamens numerous. 

 Fertile flowers terminal. Calyx 4-cleft. Petals 4, minute. Stigmas 2, long, 

 recurved. Fruit oblong or globose. Epicarp indehiscent. Nut incompletely 

 4-celled, furrowed or sculptured. Trees with naked buds. Leaflets serrate. 



1. J. nigra, L. (BLACK WALNUT.) Leaflets 11-21, ovate-lanceolate, 

 pubescent beneath, acuminate, slightly cordate at the base, or oblique ; fruit 

 globose, rough-dotted ; nut furrowed. Rich woods, Florida, and northward. 

 March and April. A tree 30 -50 high. 



2. J. cinerea, L. (BUTTERNUT.) Leaflets 15-19, ovate-lanceolate, acute, 

 rounded at the base, pubescent ; the petioles, fruit, &c. viscid ; fruit oblong ; nut 

 deeply sculptured, acute. Rocky woods in the upper districts. March and 

 April'. A tree 30 - 40 high. 



