bb. Leaf-sinuses rounded at the base. 
c. Lower sides of leaves and petioles distinctly downy, the 
lobes undulate or entire; leaves very thick, drooping at 
the sides..... Leet teen ees A, saccharum nigrum, p. 183. 
ce. Lower sides of leaves and petioles essentially glabrous, 
the lobes serrate; leaves not thick, not drooping at the 
sides. 
d. eaves coarsely and sparsely toothed or notched; 
bark not longitudinally white-striped; large trees. 
e. Twigs coarse; petioles exuding a milky juice when 
cut; wings of fruit diverging by nearly 180°; bark 
of the trunk closely fissured, not scaly............. 
Suara ait hab dk earn eth A, plotanoides, p. 189. 
ee. Twigs slender; petioles not exuding a milky juice 
when cut; wings of fruit diverging only slightly; 
bark of the trunk deeply furrowed, often cleaving 
in long, thick plates........... A. saccharum, p. 181. 
dd. Leaves finely and abundantly toothed; bark longi- 
bidipaliy white-striped ; a bushy tree or shrub....... 
aa. Leaves compound; twigs usually with whitish bloom....... 
eae tr At eodlney ee LALOd ea seat eyeety HEGUNED,, Pe 103. 
—173— 
