182 Lower surface of leaf pale and smoothish—Rock Maple, 
Sugar Maple, Hard Maple, Sugar-tree, Acer 8a echo rum 
Marsh. 
182 Lower surface of leaf green and hairy. A form of Rock 
Maple. Western N. K.—Black Rock Maple, Acer aaccha- 
nnn var. nigrum (Mx. f.) Britton. 
Horse-chestnut, Buckeye —leaves opposite, palmately com¬ 
pound. Several species of Buckeye from farther west are 
occasionally planted. These all differ from the common 
Horse-chestnut in having 4 petals instead of 5. 
183 Fruit prickly—184 
183 Fruit smooth. Petals 4—185 
184 Petals 5, white, spreading. Leaflets usually 7. Cult.— 
Common Horse-chestnut, Acsculnx Jlipporaxlanurn L. 
184 Petals 4, yellow, erect. Leaflets usually 5. Margins 
toothed, with tufts of hairs in the notches—Fetid Buckeye, 
Ohio Buckeye, Aescidus glabra Willd. 
185 Petals yellow—Sweet Buckeye, Yellow Buckeye, Arsenins 
octandra Marsh. 
185 Petals and calyx red or purple—Purple Buckeye, Aeseulus 
octandra var. hybrida (DC.) Sarg. 
185 Petals and calyx bright red. Usually a shrub—Red Buck¬ 
eye, A esculus Pavia L. 
Linden, Basswood —Leaves broad or round egg-shaped with an 
unsyminetrical base. Flower and fruit clusters long- 
stalked, attached near the middle of a large elongated 
leaf-like bract. Fruit globular, woody, less than % inch 
thick. 
186 Stamens attached to a petal-like body situated in front of 
the real petal—187 
186 Stamens not attached to a petal-like body. A street tree 
of southern N. K.—European Linden, Lime-tree, Tilia 
vulgaris Hayne. 
187 Fruit ribbed. Leaves white-downy beneath. Cult.—Sil¬ 
ver Linden, Tilia tomeritosa Muench. 
187 Fruit not ribbed. Native in U. S.—188 
