Proceeding's of the Ohio State Academy of Science 131 



5. Bark close, rough; leaflets 7-0, stellate pubescent: outer bud scales 



falling away in autumn; husk not separating quite to the base; 

 twigs and petioles tomentose. H. alba. 



6. Leaflets 3-5, rarely 7, nut rounded at the base, i-1 in. long. 7. 



6. Leaflets 7-9; nut usually pointed at both ends, l-lj in. long. //. 



laciiiiosa. 



7. Leaflets oblong-lanceolate to obovate : twigs puberulent. H. ovata.- 



7. Leaflets narrowly lanceolate; twigs glaucous. H. caroliiiac-septcn- 



trionalis. 



8. Fruit nearly globular; nut thin-shelled; bark of old trees separating 



in strips. 9. 



8. Fruit obovoid ; nut thick-shelled; bark close. 10. 



9. Fruit little flattened; middle lobe of staminate calyx short; leaflets 



5-7. H. inicrocarpa. 



9. Fruit much flattened; middle lobe of staminate calyx long; leaflets 



5, occasionally 3. H. borcalis. 



10. Leaves glabrous or nearly so ; leaflets 5-7, rarely 3 or 9. H. glabra. 

 10. Leaves with silvery peltate glands ; leaflets 5-9. //. villosa. 



1. Hicoria pecan (Marsh.) Britt. Pecan (Hickory). A 

 large tree of rapid growth with rough bark and a long tap root. 

 Leaflets 11-15, oblong-lanceolate, .short-stalked, inequilateral, 

 acuminate; fruit oblong-cylindric ; husk thin, 4-valved ; nut 

 smooth, oblong, thin-shelled, pointed, seed delicious and important 

 commercially; wood like li. ovata. Along streams and in moist 

 soil. Ind. to Iowa, south to Ky. and Tex. 



2. Hicoria minima (Marsh.) Britt. Bitternut (Hickory).. 

 A slender tree with close rough bark. Leaflets 7-9, sessile, long- 

 acuminate, the lateral ones falcate ; fruit subglobose, narrowly 

 6-ridged ; husk thin tardily and irregularly 4-valved ; nut short- 

 pointed, thin-shelled. Wood heavy, strong, and tough. In moist 

 woods and swamps. Quebec to Minn., Fla., and Tex. Ohio. 



3. Hicoria aquatica (Mx. f.) Britt. Water Hickory. A 

 tree with close bark, living in swamps. Leaflets 9-13, lanceolate, 

 or the terminal one oblong, long acuminate at the apex, narrowed 

 at the base, the lateral ones falcate ; fruit oblong, ridged, pointed r 

 husk thin, tardily splitting ; nut oblong, thin-shelled, angular. 

 Wood of poorer quality than that of other hickories. Va. to Fla., 

 111., Ark., and Tex. 



4. Hicoria ovata (Mill.) Britt. Shagbark (Hickory), 



