■82 Proceedings of the Ohio State Academy of Science 



15. Leaves evergreen, coriaceous, some on wood of the 

 previous season. 16. 



15. No leaves on wood of the previous season. 17. 



16. Leaves green on both sides, thick, coriaceous, oblong to 



oblanceolate, 5-10 in. long; winter buds very scaly. 



Rhododendron. (62). 



16. Leaves green on both sides, or glaucous beneath, 



coriaceous, 2-5 in. long ; oval or oval-l.anceolate, winter 

 buds naked. Kalmia. (63). 



17. Pith with prominent diaphragms but solid; vascular 



bundles in base of petiole 3-7. 18. 



17. Pith not both diaphragmed and solid, but sometimes 



with lenticular cavities. 19. 



18. Leaves 2-ranked ; bark with fetid odor ; vascular bundles 



in base of petiole 5-7. Asimina. (34). 



18. Leaves not 2-ranked ; vascular bundles in base of 



petiole 3. Nyssa. (76). 



19. Leaves resin-dotted, waxy-dotted or punctate, oblong- 



lanceolate, spatulate, or oblanceolate, short-pointed, 

 narrowed at the base. Myrica. (13). 



19. Leaves not dotted nor punctate. 20. 



20. Pith prominently 5-angled ; leaves with deciduous 



stipules and with bristle tips. Quercus. (22). 



20. Pith cylindrical or nearly so ; leaves not bristle- 



tipped. 21. 



21. Leaves with the upper 2 lateral veins more or less 



parallel with the midrib. Cornus. (75). 



21. Leaves pinnately veined to the tip. 22. 



22. Bundle scar central; pith sometimes diaphragmed with 



lenticular cavities. 23. 

 22. Bundle scars 2 or more; pith without lenticular 



cavities. 24. 

 .23. Leaves truncate or short-pointed at the base, usually 



widest below the middle or somewhat oblong, glabrous 



when mature ; fruit a large pulpy berry, very astringent 



when green. Diospyros. (66). 



