94 Proceedings of the Ohio State Academy of Science 



22. Not with three distinct bundle scars. 23. 



22. With three bundle scars. 24. 



23. Buds and twigs glabrous or nearly so ; with few thorns. 



Rhamnus. (60). 



23. Buds and sometimes twigs pubescent or downy ; thorns 



prominent. Bumelia. (65). 



24. Terminal bud self-pruned: twigs some shade of black, 



broAvn, or reddish. Prunus. (42). 



24. Terminal bud present. 25. 



25. Buds conical, pungent, pubescent, twigs glabrous or 



nearly so, mostly yellow-olive ; trees with erect growth, 

 the branches not spreading as in most of the apples. 



Pyrus. i^y). 



25. Buds downy or pubescent, twigs usually pubescent, if 



gdabrous then dark reddish-brown ; trees with rounded 

 crowns and spreading branches. Malus. (38). 

 —26— 



26. Leaf scars quite regularly 2-ranked, that is with the third 



scar over the first, zy. 



26. Leaf scars not 2-ranked. 38. 



2y. Bundle scar i ; visible bud scales 2 ; twigs brown ; pith 

 sometimes with cavities. Diospyros. (66). 



27. Bundle scars 3. 32. 



2y. Bundle scars more than 3, usually scattered. 28. 



28. Pith diaphragmed, solid; bundle scars 5-7; bark wath 



fetid odor; terminal bud elongated, naked, silky; 

 stipular scars none. Asimina, (3^). 



28. Pith not diaphragmed ; b.ark not with fetid odor. 29. 



29. Buds very long-pointed, with 10-20 visible scales; 



medullary ra3^s very prominent ; stipular scars narrow, 

 extending some distance around the twig. 



Fagus. (20). 



29. Visible bud scales less than 10; terminal bud self- 



pruned. 30. 



30. Visible bud scales 1-3. 31. 



30. Visible bud scales more than 3 ; pith white, rather large. 



Morus. (26). 



