ff. Bundle-scars 4-many. 



g. Bundle-scars in a single U-shaped line, 

 h. Terminal bud present; fruit berry-like; a 



shrub or small tree PYRUS, p. 143. 



hh. Terminal bud absent; fruit not berry-like; 

 large trees. 



i. Stipule-scars present; twigs slender. 

 j. Stipule-scars encircling the twig; leaf- 

 scars nearly surrounding the bud; bark 

 peeling off in thin plates, exposing the 



lighter colored inner bark 



PLATANUS, p. 141. 



jj. Stipule-scars not encircling the twig; leaf- 

 scars not nearly surrounding the bud; 

 bark thick, rough-ridged, not exposing the 



inner bark ULMUS, p. 123. 



ii. Stipule-scars absent; twigs very stout. 



j. Bundle-scars usually not more than 5 



GYMNOCLADUS, p. 163. 



jj. Bundle-scars usually 6-12 



AILANTHUS, p. 171. 



gg. Bundle-scars variously grouped or scattered, 

 but not in a single line, 

 h. Terminal bud present, 

 i. Stipule-scars present, 

 j. Stipule-scars encircling the twig; visible 



bud-scales 2, united 



URIODENDRON, p. 137. 



jj. Stipule-scars not encircling the twig; vis- 

 ible bud-scales more than 2, not united, 

 k. Buds 4 times as long as broad, not 

 clustered at the tips of vigorous shoots; 



fruit a prickly bur FAGUS, p. 93. 



kk. Buds not 4 times as long as broad, 

 usually clustered at the tips of vig- 

 orous shoots ; fruit an acorn 



QUERCUS, p. 98. 



ii. Stipule-scars absent CARYA, p. 67. 



hh. Terminal bud absent (occasionally present in 

 Castanea). 



xxxi 



