98 Proceedings of the Ohio State Academy of Science 



53. With polished, greenish-brown, grayish-yellow, or red 

 twigs; bark sour; leaf scar prominent, semi-oval, with 

 a dark central scar usually in thp form of a ring; 

 buds small, not projecting much beyond the epidermis; 

 the large terminal panicled raceme with capsules per- 

 sisting all winter. Oxydendrum. (64). 



53. With 2 visible scales in the triangular flattened bud ; 



pith sometimes with lenticular cavities ; twigs pubes- 

 cent, zigzag at the tip. Diospyrcs. (66). 



—54— 



54. Outer bud scales more than i. 55. 



54. Outer bud scale i ; twigs usually with brittle zones and 



hence very easily detached ; stipular scars present ; 

 bundle scars 3. Salix. (12). 



55. Pith diaphragmed but solid ; bundle scars 3 ; no stipular 



scars. Nyssa. (76). 



55. Pith not diaphragmed. 56. 



56. Pith more or less 5-angled. 57. 



56. Pith cylindrical or nearly so. 61. 



57. Buds clustered at the tip of the twig; bundle scars 



numerous, scattered. Quercus. (22). 



57. Buds not clustered at the tip. 58. 



58. Bundle scars numerous usually scattered. 59. 



58. Bundle scars 3. 60. 



59. Buds small with about 3 outer scales ; twigs reddish or 



yellowish-brown, glabrous or pubescent; terminal bud 

 •present or absent; stipular scars prominent. 



Castanea. (21). 



59. Terminal bud large with 4 or more visible scales, hairy 



or peltate pubescent ; lateral buds usually superposed ; 

 twigs tough. Hicoria. (15). 



60. Without stipular or self-pruning scars ; crushed buds 



fragrant, aromatic, not resinous, glabrous. 



Liquidambar. (30). 



60. Stipular and self-pruning scars present: crushed buds 



not fragrant though they may have a resinous odor. 



