22 
128 Acorn large, more than % inch long—Red Oak, Quercus v 
rubra L. 
129 Blade not six times as long as the leaf-stalk. Leaves 
generally angularly lobed, broadest near the middle, 
grayish white-hairy beneath—Scrub Oak, Bear Oak, Bar¬ 
ren Oak, Quercus Uicifolia Wang. 
129 Blade more than six times as long as the leaf-stalk. Leaves 
greatly broadened at the apex, usually without any pro¬ 
nounced lobes, rusty-hairy beneath. Long Island— 
Black Jack Oak, Jack Oak, Quercus inarilandica Mueneh. 
180 Lower surface of mature leaves smooth, or nearly so—131 
130 Lower surface of mature leaves hairy—133 
181 Leaf-margins with many coarse rounded teeth which do 
not reach more than to the midrib—Chestnut Oak, 
Rock Chestnut Oak, Quercus Prinus L. 
131 Leaf-margins lobed—132 
182 Base of blade pointed—White Oak, Quercus alba L. 
132 Base of blade ear-shaped (auriculate). Cult.—English Oak, 
Quercus Robar L. v 
Note: —A less common variety of the English Oak (var. ses- 
siliflora) occasionally has a tapering base to the blade, 
when it closely resembles the leaf of the White Oak. It 
may generally be separated from the latter by the rather 
firm prominently furrowed dark bark, the bark of the 
White Oak being light gray, with a decided tendency to 
become flaky or scaly rather than prominently furrowed. 
133 Deepest marginal indentations usually not reaching more 
than J<* to the midrib—134 
133 Deepest marginal indentation usually reaching or more 
to the midrib, at least in most of the leaves—180 
134 Fruit-stalk much longer than the leaf-stalk—Swamp White 
Oak, Swamp Oak, Quercus bicolor Willd. 
184 Fruit-stalk shorter than the leaf-stalk—135 
135 Leaf-margins with coarse rounded teeth—Chestnut Oak, 
Rock Chestnut Oak, Quercus Prinus L. 
135 Leaf-margins with coarse sharp teeth. Western N. E.— 
Yellow Oak, Chinquapin Oak, Chestnut Oak, Quercus ) 
Muhlenbergii Engelm. 
