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............... 
sdavinteicistemina tees hes PLATANUS, p. 141. 
jj. Stipule-scars not encircling the twig; leaf- 
scars not nearly surrounding the bud; 
bark thick, rough-ridged, not exposing the 
aniver (bar ke xy. sone es ULMUS, p. 123. 
ii. Stipule-scars absent; twigs very stout. 
" j. Bundle-scars usually not more than 5.... 
oan ti ec acennty GYMNOCLADUS, p. 163. 
jj. Bundle-scars usually 6-12.............0.. 
stad Whisnant 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..................00. 
aid hel hnagueicnm LIRIODENDRON, 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.......... 
Rie ai uAtohene aa tans a QUERCUS, p. 98. 
ii. Stipule-scars absent......... CARYA, p. 67. 
h. Terminal bud absent (occasionally present in 
Castanea), 
— XXxI — 
