98 Proceedings of tin- Ohio State Academy of Science 



53. W'itli polished, _ii;^reeiiish-l)r(jwn. <;r.'iyisli-yello\v, or red 

 twif^s : bark sour; leaf scar prominent, .-enii-oval. with 

 a (lark central scar usually in the form of a ring; 

 buds small, not projecting much 1x-_\-ond the epidermis; 

 the large terminal panicled raceme with capsules per- 

 sisting all winter. Oxydendrum. (64). 



53. AV^ith 2 visible scales in the triangular H.attened bud; 



])ith sometimes with lenticular cavities: twigs pubes- 

 cent, zigzag at tliC ti]). Diospyros. (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. Btids 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 l)uds usually superposed; 

 twigs tough. Hicoria. (15). 



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



fragrant, arom.atic, not resinous, glabrous. 



Liquidambar. (30). 



60. Stipular and self-i)runing scars present ; crushed buds 



not fragrant though they mav have ,a resinous odor, 



