442 JUGLANDACE.E. (WALNUT FAMILY.) 



3. C. Olivseformis, Nutt. (PECAN-NUT.) Leaflets 13-15, lanceolate- 

 obloug, serrate, falcate, acuminate ; nut olive-shaped, smooth, thin-shelled, 

 somewhat 4-angled. River bottoms, Mississippi, northward and westward. 

 A large tree with smoothish bark. 



* * Epicarp partly 4-va/ved : 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-augled. Rich soil. March -April. A large tree, 

 with rough bark. 



5. C. glabra, Torr. (PIGNUT.) Leaflets 5-7 (mostly 7), ovate-lance- 

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

 thin, parted to the middle, coriaceous ; nut thick-shelled, sometimes angled. 

 (C. porciua, Nutt.) Woods. March -April. A large tree, with smoothish 

 bark. 



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

 glandular beneath, acuminate; aments smooth ; fruit roundish ; epicarp thin ; 

 nut thin-shelled, slightly 4-augled. Mountains of North Carolina, and north- 

 ward. April -May. A large tree. Fruit f in diameter. 



7. C. myristicseformis, Nutt. " 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. March - April. 

 A tree of moderate dimensions, with smooth bark, and very bitter and astrin- 

 gent seeds. 



9. C. aquation, Nutt. Leaflets 9-13, lanceolate, acuminate, slightly 

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

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

 Florida to South Carolina. March- 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 iudehiscent. 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, chiefly in the upper dis- 

 tricts. March - 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, etc. viscid ; fruit 

 oblong ; nut deeply sculptured, acute. Rocky woods in the upper districts. 

 March - April. A tree 30 - 40 high. 



