94 Procccdiui^s of flic Ohio Statr Acadciiiy of Science 



22. Kol with three distinct l)Uii(llc scars. 23. 



22. Witli three l)undle scars. 24. 



23. Jiuds and twigs gia])rous or nearly so; with few thorns. 



Rhamnus. (60). 



23. Huds and sometimes twigs pubescent or downv: thorns 



])rominent. Bumelia. (65). 



24. ^\M■m'nal l)ud self-pruned; twigs some shade of black, 



brown, or reddish. Prunus. (42). 



24. Terminal 1)Ik1 present. 25. 



25. Jluds 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. (37). 



25. r.uds downy or pubescent, twigs usually pubescent, if 



glabrous then dark reddish-brown ; trees with rounded 

 crowns and spreading branches. Malus. (38). 



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



scar over the first. 2^. 



26. Leaf scars not 2-ranked. 38. 



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



sometimes with cavities. Diospyros. (66). 

 27. Bundle scars 3. 32. 



27. Bundle scars more than 3, usually scattered. 28. 



28. Pith diaphragmed, solid; l)undle scars 5-7; bark with 



fetid odor; terminal bud elongated, naked, silky; 

 stipular scars none. Asimina. (31). 



28. Pith not diaphragmed ; b.'irk not with fetid odor. 29. 



29. F>uds very long-pointed, with 10-20 visible scales; 



medullary rays very prominent; stipular scars narrow, 

 extending some distance around the twig. 



Fagus. (20). 



29. Visible bud scales less tl'\an 10; terminal 1)ud self- 



pruned. 30. 



30. Visible bud scales 1-3. 31. 



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



Morus. (26). 



