5 8 



JUGLANDACEAE. 



VOL. I. 



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 l / 2 ' long. 

 Bark close, rough ; foliage very pubescent and fragrant. 



Rachis of the leaves and staminate 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. 



4. H. ovata. 



5. H. carolinae- 

 septentrionalis. 



6. H. lacinosa. 



7. H. alba. 



8. H.pallida. 

 about as long as the 



9. //. microcarpa. 



10. H. borealis. 



11. H.glabra. 



12. H. villosa. 



I. Hicoria Pecan (Marsh) Britton. Pecan. Illinois Nut. Soft-shell Hickory. 



Fig. 1423. 



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, 

 5'-6' long; bract of the staminate calyx linear, much longer 

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

 ii'-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 Ibs. 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. 



17^7- 



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 100 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'-ii' 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"-l2" long, thin- 

 shelled; seed very bitter. X 



In moist woods and swamps, Quebec to southern Ontario, 

 Minnesota, Florida and Texas. Ascends to 3500 ft. in Virginia. Wood hard and strong, dark 

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

 ripe Sept.-Oct. 



