92 Proceedings of the Ohio State Academy of Science 



subulate leaves spreading" ; one or both types of leaves 

 on a plant; carpellate cone developing into a bluish- 

 black berry-like fruit. Juniperus. (lo). 

 8. Leaves with spine-tipped lobes or teeth. Ilex. (54). 



8. Leaves without spines. 9. 



9. Leaves pubescent at least below, lanceolate, mucronate, 



not evergreen; buds clustered at the tip of the twig; 

 trees with 5-angled pith. Quercus. (22). 

 9. Leaves glabrous. 10. 



10. Leaves green on both sides, thick, coriaceous, oblong 

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



Rhododendron. (62), 



10. Leaves green on both sides or glaucous beneath, 



coriaceous, 2-5 in. long, oval to oval-lanceolate ; winter 

 buds niaked ; erect shrubs. Kalmia. (63). 



— II — 



11. Twigs with thick wart-like dwarf branches ; conifers. 12. 



11. Twigs without true dwarf branches. 13. 



12. Young twigs covered with scales. Larix. (3). 



12. Twigs without scales. Ginkgo, (i). 



13. Twigs with numerous small scattered self-pruning scars, 



without apparent leaf scars but with minute dry scale 

 leaves, with feather-like dwarf branches, some usaally 

 remaining in winter ; foliage leaves spreading into two 

 ranks ; roots often with knees ; a conifer. 



Taxodium. (7). 



13. Twigs with evident leaf scars and lateral winter buds. 14. 



14. Leaf scars alternate. 15. 



14. Leaf scars opposite or whorled. 72. 



15. Twigs with distinct and complete stipular ridges or 



rings at the leaf nodes. 16. 



15. Twigs without complete stipular rings. 18. 



16. Leaf scar surrounding the axillary bud, terminal bud 



self-pruned ; wood with prominent medullary rays. 



Platanus. (31). 



