■84 Proceedings of the Ohio State Academy of Science- 



31. Buds sessile; leaves doubly serrate; bark not scaling" 

 off in plates. Ulmus. (23). 



31. Buds sessile; lea^^es serrate; bark scaling" oft in plates 



like in the Sycamore. Planera. (24). 



32. Lateral veins ending in the large dentations or serra- 



tions which are always simple (a vein for each). 33. 



32. Leaves doubly serrate or sometimes simply serrate, the 



lateral veins ending in the main serrations or teeth 

 but not in the smaller ones, or the veins not ending in 

 the serrations. 34. 



33. Leaves ovate or ovate-oblong, short acuminate ; teeth 



not with slender points ; bark smooth, light-gray. 



Fagus. (20). 



33. Leaves oblong-lanceolate, acuminate, with slender often 



inwardly curved points on the serrations; bark rough. 



Castanea. (21). 



34. Lateral veins rot ending in the serrations or teeth. 



Amelanchier. (40). 



34. Lateral veins ending in some of the serrations, teeth or 



lobes. 35. 



35. Bark smooth, the trunk and larger branches with fluted 



or projecting" ridges ; leaves acute or acuminate, sharply 

 doubly serrate; nuts sm;all, in a large-bracted catkin. 



Carpinus. (16). 



35. Trunk and larger branches not with fluted or projecting 



ridges. 36. 

 .36. Bark of trunk and larger branches separating into paoery 

 or leathery sheets ; trees or shrubs with glabrous, 

 pubescent, or glandular-warty twigs. Betula. (18). 



36. B;ark of trunk scaly, fine furrowed; twigs pubescent; 



carpellate catkin in fruit appearing like that of the hop. 



Ostrya. (17). 



36. Bark scaling off in plates like in the Sycamore ; fruit 



coriaceous, nut-like. Planera. (24). 



—37— 

 2y. Leaves 2-ranked. 38. 



37. Leaves not 2-ranked. 39. 



