Proceedings of the Ohio State Academy of Science 101 



73. Pith with cavities or more or less diaphragmed ; axillary 

 buds superposed. Paulowina. (72). 



73. Pith solid; axillary buds small and flat, not superposed, 



leaf scars often in trees. Catalpa. (ys'^- 



74. Twigs very green, more or less 4-angled ; pith diamond- 



shaped or rhomboidal. Euonymus. (55). 



74. Twigs not green when ripe but gray, brown or red, some- 



times 4-;angled ; pith cylindrical or nearly so. 75. 



75. Terminal bud absent, the twig usually ending in a thorn. 



Rhamnus. (60) . 



75. Terminal bud present. 76. 



76. Axillary buds often superposed ; twigs often with thorns ; 



leaf scars small. Adelia. (70). 



76. Axillary buds not superposed ; no thorns on the twigs ; 

 leaf scars rather large, yy. 



yy. Twigs and buds pubescent; lateral buds cylindrical or 

 hem'spherical ; bud scales dry; leaf scar concave, on 

 the sl'ort petiole base; lenticels large and conspicuous;, 

 fruit a drupe. Chionanthus. (71). 



yy. Buds rough or pubescent ; twigs glabrous or pubescent, 

 sometimes 4-angled; lateral buds somewhat flattened, 

 obtuse ; bud scales rather dry ; leaf scar close to the 

 bark ; lenticels not large ; fruit a samara. 



Fraxinus. (69). 



78. With 4 distinct stipular scars; terminal bud self-pruned; 

 twigs green with strong odor. Staphylea. (56). 



78. Without definite stipular scars; twigs not. green or if 



so then the terminal bud present. 79. 



79. Trees of shrubs with numerous bundle scars, sometimes 



m 3 areas, in a large heart-sh;aped leaf scar ; pith rather 



large ; terminal bud large, with numerous scales. 



^sculus. (58). 

 79. Bundle scars 3 or sometimes 5. 80. 

 8q. Terminal bud with 2 long acuminate pubescent outer 



scales ; line connecting the uppermost leaf scars 



notched. Cornus. (75). 



