Maple— Leaves opposite, palmately veined when simple. Fruit 
with a long imsymmetrical flat wing. 
174 Leaves simple—175 _^ , . 
174 Leaves compound. Western N. E. Cult, and escaped 
—Box Elder, Ash-leaved Maple, Acer Negundo L. 
175 Juice milky. Cult.—Norway Maple, Acer platanoides L. 
175 Juice not milky—17(» 
170 Flower and fruit stalks arising from a common much 
elongated axis—177 
176 Flower and fruit stalks apparently arising from a common 
point—179 
177 Flower and fruit clusters erect or nodding, but not pen¬ 
dulous. Common northward but rare in southern N. E. 
—Mountain Maple, Acer micatum Lam. 
177 Flower and fruit clusters drooping or pendulous—178 
178 Bark of small branches light green, striped with either 
whitish or dark lines. Leaves smooth, usually with 8 
shallow taper-pointed lobes. Common in northern N. 
E. but rare southward—Striped Maple, Moosewood, 
Striped Dogwood, dec/* pcnnsylvanicum L. 
178 Bark of small branches not striped. Leaves usually 5- 
lobed and downy-hairy beneath. Cult.—Sycamore Maple, 
European Sycamore, Acer Pseudo-Platan us L. 
179 Flowers in rather close clusters, not drooping, appearing 
before the leaves in early spring—180 
179 Flowers in drooping clusters, on long slender hairy stalks— 
182 
180 Leaves deeply 5-lobed. Petals none—White Maple, Silver 
Maple, Soft Maple, Acer saccharinum L. 
180 Leaves not cut half way to the base. Petals present—181 
181 Leaves 8 to (> inches long, middle lobe oblong at base. 
Quite variable—Red Maple, Swamp Maple, Soft Maple, 
Acer rubnnn L. 
181 Leaves 2 to 4 inches long, middle lobe broadly triangular. 
Merely a form of the Red Maple. Mass, southward— 
Three-toothed Red Maple, Acer rubrum var. tridens Wood. 
