Procecdiiii^s of the Ohio State Acad any of Science 101 



73. Pith with cavities or more or less diaphrag-med : axillary 



buds superposed. Paulowina. {'/2). 

 JT,. Pith solid ; axillary buds small and tlat. not superposed,, 

 leaf scars often in trees. Catalpa. (73). 



74. Twi^s very green, more or less 4-angled ; pith diamond- 



shaped or rhomboidal. Euonymus. (55). 



74. Twigs not green wdien 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 i)ubesccnt ; lateral Ijuds cylindrical or 

 hemispherical; bud scales dry; leaf scar concave, on 

 the short 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 saiuar.a. 



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 or 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. 



80. Terminal bud with 2 long acuminate pubescent outer 



.'■"cales; line connecting the uppermost leaf scars 

 notched. Cornus. (75). 



