Proceedings of the Ohio State Academy of Science 105 



6. Perianth none ; sometimes a minute border, cup, or gland 



may represent the calyx. 7. 

 6. Only the calyx present, sepals distinct or united, green or 



colored. 9. 



6. Calyx and corolla both present, calyx may be minute. 16. 



7. Leaves alternate, simple. 8. 



7. Leaves opposite, compound ; flowers in crowded panicles or 



racemes. Oleaceae. 



a. Fraxinus. (69). 



■8. Both staminate and carpellate flowers in aments ; ovulary 



uni-locular many-seeded ; seeds with a tuft of cottony 



hairs. Salicaceae. 



a. Stamens numerous, bracts fimbriate or incised ; buds 



with several scales ; pith 5-angled. Populus. (11). 



a. Stamens 2-10, bracts entire; buds with one outer 



scale. Salix. (12). 



8. Both staminate and carpellate flowers in aments, ovulary 



uni-locular with i erect ovule : carpellate flowers single 

 in each bract of the ament. Myricaceae. 



a. Myrica, (13). 



8. Both staminate and carpellate flowers in aments, ovulary 

 bi-locular ; carpellate flowers 2 or mere in each bract of 

 the anient, or capitate. Betulaceae. 



See II below. 



8. Flowers monoecious in dense heads; base of petiole cover- 

 ing the axillary bu;l. Flatanaceae. 



a. Platanus. (31). 



8. Flowers imperfectly bisporangiate or monoecious, crowded 



into catkin-like heads; ovules i -several in each cavity; 

 stamens 4-many. BLamamelidaceae. 

 a. Liquidambar. (30). 



9. Flowers, at least the staminate ones in aments or ament-like 



spikes. 10. 



