t Stipule-scars present. 
j. Bud-scale only 1 visible; twigs brittle... 
Doe Nhl ee whe Mice o Ss RRR SALIX, p. 34. 
ij. Bud-scales 2 or more; twigs not brittle. ° 
k. Bark smooth, close, warty or peeling 
into papery layers, but not flaky nor 
rough-ridged. 
1. Tip of bud appressed; fruit berry- 
LiKey cua wane cea eyes CELTIS, p. 131. 
ll. Tip of bud not appressed; fruit not 
berry-like. 
m, Trunk fluted; catkins not present 
in winter; lenticels not elongated 
horizontally; low tree or ‘bushy 
SHOUD cc cana ee CARPINUS, p. 83. 
mm. Trunk not fluted; catkins usually 
present in winter; lenticels elong- 
ated horizontally; large trees..... 
siatiscnnasienseo mark BETULA, p. 85. 
kk. Bark flaky or rough-ridged, not warty 
nor peeling off in papery layers. 
1. Bundle-scars depressed, conspicuous; 
bark thick, more or less deeply fur- 
LOW Eden velctecded sa ULMUS, p. 123. 
ll. Bundle-scars not depressed, incon- 
spicuous; bark thin, broken into nar- 
row, flattish strips, loose at the ends.. 
ee ee ee OSTRYA, p. 81. 
i Stipule-scars absent. 
j. Buds silky-pubescent, depressed; twigs 
stout, clumsy, blunt, with conspicuous 
leaf-scars..... GYMNOCLADUS, p. 163. 
jj. Buds glabrous, not depressed; twigs slen- 
der, with inconspicuous leaf-scars. 
k. Buds % inch long, obtuse, somewhat 
flattened and appressed; pith with red- 
dish longitudinal streaks.............. 
bk ve hy bnitinadhed sees CERCIS, p. 167. 
kk. Buds %-%4 inch long, acute, not flat- 
tened nor appressed; pith without red- 
dish streaks...... .“PRUNUS, p. 153. 
— Xxx — 
