5 So JUGLANDACEAE. 



Bark shaggy, separating in long plates ; foliage glabrous or puberulent 

 Leaflets 3-5 (rarely 7) ; nut rounded at the base, 6"-io" long. 

 Leaflets oval to oblong-lanceolate, puberulent. 

 Leaflets lanceolate, glabrous or glaucous beneath. 



Leaflets 7-9 ; nut usually pointed at both ends, i'-i y ? ' long. 

 Bark close, rough ; foliage very pubescent and fragrant. " 



Rachis of the leaves and starainate catkins densely hirsute. 



Rachis and staminate aments scurfy, at least when young. 

 Husk of fruit not freely splitting to the base ; bract of the staminate calyx 

 lobes. , 



Fruit nearly globular ; nut thin-shelled ; bark shaggy, at least when old. 



Fruit little flattened ; bract of staminate calyx short. 



Fruit much flattened ; bract of staminate calyx long. 

 Fruit obovoid ; nut thick-shelled ; bark close. 



Foliage glabrous, or little pubescent ; anther-sacs acute. 



Foliage pubescent or scurfy ; anther-sacs obtuse. 



Vol. I. 



4. H. ovata. 



5. H. carolinae- 

 septentrionalis, 



6. H. lacinosa. 



7. H. alba. 



8. H. pallida. 

 about as long as the 



9. H. microcarpa. 



10. H. borealis. 



11. H. glabra. 



12. H. viltosa. 



Hicoria Pecan (Marsh) Britton. Pecan. 



Fig. 1423. 



Illinois Nut. Soft-shell Hickory. 



Juglans Pecan Marsh. Arb. Am. 69. 1785. 

 Carya olivaeformis Nutt. Gen. 2: 221. 1818. 

 Hicoria Pecan Britton, Bull. Torr. Club 15: 282. 



1888. 



A large slender tree, with somewhat roughened bark, 

 maximum height of 170° and trunk diameter 6°. Young 

 twigs and leaves pubescent; mature foliage nearly gla- 

 brous; bud-scales few, small, valvate; leaflets 11-15, fal- 

 cate, oblong-lanceolate or ovate-lanceolate, short-stalked, 

 inequilateral, acuminate, 4'-7' long ; staminate aments sessile 

 or nearly so in the axils of leaf -scars near the end of twigs 

 of the preceding season or sometimes, on the young shoots, 

 S'-6' long; bract of the staminate calyx linear, much longer 

 than the broadly oblong lateral lobes ; fruit oblong-cylindric, 

 i¥-2i' long; husk thin, 4-valved; nut smooth, oblong, thin- 

 shelled, pointed, 2-celled at base, dissepiments thin, very 

 astringent; seed delicious. 



In moist soil, especially along streams, Indiana to Iowa and 

 Kansas, south to Alabama and' Texas. Wood hard, brittle, light 

 brown ; weight 45 lbs. April-May. Fruit ripe Sept.-Oct. 



2. Hicoria cordiformis (Wang.) Britton. Bitter-nut. Swamp Hickory. Fig. 1424. 



Juglans alba minima Marsh. Arb. Am. 68. 1785. 



Juglans cordiformis Wang. Nordam. Holz. 25, pi. 10, f. 25. 



17S7. 

 Carya amara Nutt. Gen. 2:222. 1818. 

 Hicoria minima Britton, Bull. Torr. Club 15: 284. 1888. 

 Hicoria cordiformis Britton, N. A. Trees 228. 1908. 



A slender tree, sometimes ioo° high, with trunk 3 

 in diameter, the bark close and rough. Bud-scales 6-8, 

 small, valvate, caducous, young foliage puberulent, 

 becoming nearly glabrous; leaflets 7-9, sessile, long- 

 acuminate, lanceolate or oblong-lanceolate, 3'-6' long, 

 i'-il' wide, the lateral ones falcate; staminate aments 

 slightly pubescent, peduncled in 3's at the bases of 

 shoots of the season or sometimes on twigs of the pre- 

 vious year; lobes of the staminate calyx about equal, 

 the bract narrower; fruit subglobose, narrowly 6-ridged 

 i'-ii' in diameter; husk thin, tardily 4-valved; nut little 

 compressed, not angled, short-pointed, 9"-I2" long, thin- 

 shelled ; seed very bitter. 



In moist woods and swamps, Quebec to southern Ontario, 

 Minnesota, Florida and Texas. Ascends to 3300 ft. in Virginia. Wood hard and strong, dark 

 brown ; weight per cubic foot 47 lbs. Bitter pignut. Bitter or pig-hickory. May-June. Fruit 

 ripe Sept.-Oct. 



