Tree of Heaven, 76. Trefoil, 74. Tsuga, 182. Tulip-tree, 66. Tupelo, 113. Turkey Oak, 159. Ulmus, 133-135. Umbrella-pine, 191. Umbrella-tree, 65. Urticaceæ, 133. Venetian Sumac, 91. Verbenaceæ, 129. Viburnum, 113, 114. Vine Maple, 88. Vitex, 129, 130. Wahoo, 78, 135. Walnut, 140, 141. Walnut Family, 140. Washington Thorn, 105. Water Ash, 124. Beech, 151. Locust, 96. Oak, 157. Weeping Ash, 125. Birch, 146. Elm, 134. Oak, 159. Willow, 164. White Ash, 123. Basswood, 73. Birch, 145, 146. Cedar, 194, 195. Elm, 134, 135. Fir, 186. Maple, 85. Mulberry, 138. Oak, 153, 154. Poplar, 168. Spruce, 179. Willow, 164. White-heart Hickory, 142. Whitewood, 72. Willow, American Bay, 164. Ash-colored, 167. Bay, 164, 165. Beaked, 166. Black, 163. Bog, 166. Brittle, 163. Crack, 163. Glaucous, 166. Goat, 166. Gray, 167. Heart-leaved, 165. Kilmarnock, 166. Willow, Laurel-leaved, 165. Long-leaved, 167. Purple, 165. Shining, 164. Weeping, 164. White, 164. Willow Family, 161. Willow-oak, 158. Winged Elm, 135. Witch-elm, 134. Witch-hazel, 107. Witch-hazel Family, 107. Xanthoxylum, 73. Yellow-barked Oak, 156. Yellow Birch, 146. Cucumber-tree, 64. Haw, 106. Plum, 98. Yellow-wood, 93. Yew, 199. Yulan, 65. Zizyphus, 80.