Proceedings of the Ohio State Academy of Science 131 



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



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

 twigs and petioles tomentose. H. alba. 



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



(). Leaflets 7-!'; nut usually pointed at both ends. 1-1^ in. long. //. 

 laci)iiosa. 



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



7. Leaflets narrowly lanceolate; twigs glaucous. //. cainlinac-scptcn- 



fridiialis. 



8. Fruit nearly globular; nut thin-slielled : 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 



r)-7. //. iiii':rocarl>a. 



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



'"), occasionally 3. H. boj-calis. 



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

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



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

 large tree of rapid growth with rough l^ark and a long tap root. 

 Leaflet.s 11-15. oblong-lanceolate, short-stalked, ine(|uilateral, 

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

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

 commercially; wood like II. ovata. .\long streams and in moist 

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



2. Hicoria minima (Marsh.) Tiritt. Bitternut (Hickory), 

 A slender tree with close rough bark. l>eaflets 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. Tn 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 swamjjs. 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 - 

 husk thin, tardily splitting; nut oblon-.^, thin-shelled, angular. 

 Wood of poorer quality than that of other hickories. A^a. to Fla., 

 111., Ark., and Tex. 



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



