j. Leaves 3-5 inches long, very lustrous 
beneath; bark close, smooth, steel-gray 
Apts Eeavk eehayyh ciedicteeaae FAGUS, p. 93. 
jj. Leaves 6-8 inches long, not lustrous be- 
neath; bark fissured, brownish.......... 
Sp aedossdeaeg can uoae CASTANBA, p. 95. 
ii. Leaves pttbescent or white-tomentose, at 
least beneath; fruit not a prickly bur. 
j. Leaves 2-4 inches long, broadly ovate to 
' suborbicular; fruit a very small capsule, 
falling in spring....... POPULUS, p. 44. 
jj. Leaves 4-7 inches long, oblong-lanceolate 
to obovate; fruit an acorn, falling in 
AACN Aten aiutazd ion bois QUERCUS, p. 96. 
hh. Teeth fine, 6-many per inch of margin. 
i. Leaf-petioles laterally compressed; leaves 
tremulous ............... POPULUS, p. 44. 
ii. Leaf-petioles terete; leaves not tremulous. 
j. Leaf-blades at least 3 times as long as 
they are broad. 
k, Twigs brittle; fruit a very small cap- 
sule, falling in spring....SALIX, p. 34. 
kk. Twigs tough; fruit a fleshy drupe, fall- 
ing in late summer or autumn........ 
dais Reg edind acebaetoas PRUNUS, p. 152. 
jj. Leaf- Biaries not more than twice as long 
as they are broad. 
k. Leaf-blades about twice as long as they 
are broad. 
1. Margin of leaves singly serrate; fruit 
fleshy. 
m. Lenticels conspicuous; pith whit- 
ish or brownish; bark easily peeled 
off in papery layers; buds ovoid.. 
een Selectcaes AE De are PRUNUS, p. 152. 
mm. Lenticels inconspicuous; pith 
greenish; bark not separable into 
papery layers; buds narrow-con- 
ICAL. sive AMELANCHIER, p. 149. 
Il. Margin of leaves doubly serrate; fruit 
not fleshy. 
— XXII — 
