144 



TREES OP THE NORTHERN UNITED STATES 



eeolate to oblong-lanceolate, serrate with deep teeth. Fruit round- 

 ish-ovate, regularly separable only half-way, but friable at maturity. 

 Nut small, white, subglobose, with a very thin shell and an ex- 

 tremely bitter kernel. Large tree with 

 orange-yellow winter buds, and firm, not 

 scaly, bark. Wild throughout, and some- 

 times cultivated. 



7. C&rya olivsefdrmis, Nutt. (PECAN- 

 NUT.) Leaflets 13 to 15, ovate-lanceolate, 

 serrate ; lateral ones nearly sessile and 

 decidedly curved. Fruit oblong, widest 

 above the middle, with 4 distinct valves. 

 Nut oblong, li^ in.', nearer smooth than 

 the other edible Hickory-nuts, the shell 

 thin, but rather too hard to be broken 

 bythe fingers. The kernel is full, sweet, 



O. olivf6rmis. &nd gQod A tall fcree> SQ t() 90 f t high 



Indiana and south ; also cultivated, but not very successfully, as 

 far north as New York City. 



ORDER XXXIX. CUPULIFEBJE. (OAK FAMILY.) 



This order contains more species of trees and shrubs in 

 temperate regions than any other, except the Coniferse. 

 The genus Quercus (Oak) alone contains about 20 species 

 of trees in the region covered by this work. 



GENUS 83. BlSTTJLA. 



Trees or shrubs with simple, alternate, mostly straight- 

 veined, thin, usually serrate leaves. Flowers in catkins, 

 opening in eai'ly spring, in most cases before the leaves. 

 Fruit a leafy-scaled catkin or cone, hanging on till 

 autumn. Twists usually slender, the bark peeling off 

 in thin, tough layers, and having peculiar horizontal 

 marks. Many species have aromatic leaves and twigs. 



