Cornus florida (Dogwood) 262 122. Oxydendrum arboreum (Sour Wood or Sorrel Tree) 264 123. Diospyros virginiana (Persimmon) 266 124. Fraxinus americana (White Ash) 269 125. Fraxinus biltmoreana (Biltmore Ash) 271 126. Fraxinus lanceolata (Green Ash) 273 127. Fraxinus pennsylvanica (Red Ash) 275 128. Fraxinus profunda (Pumpkin Ash) 277 129. Fraxinus quadrangulata (Blue Ash) 279 130. Fraxinus nigra (Black Ash) 281 131. Adelia acuminata (Pond Brush or Crooked Brush) 283 132. Catalpa bignonioides (Catalpa) 285 133. Catalpa speciosa (Hardy Catalpa) 286 134. Viburnum prunifolium (Black Haw) 289 135. County Map of Indiana 301 136. Map showing certain areas of forest distribution 302 137. English and Metric Scales compared 303 Trees of Indiana _INTRODUCTION_ The present edition has been entirely rewritten. While the general plan of the first edition has been followed, some changes have been made. The number of trees included has been wholly arbitrary. All woody plants of the State which generally attain a maximum diameter of 10 cm. (4 inches) at breast high are regarded as tree forms. _Alnus rugosa_ which so closely resembles _Alnus incana_, is an exception, and a description of it is given to aid in the identification of our tree form of _Alnus_. Also several species of Cratægus are included which commonly do not attain tree size. The species of all Cratægus begin to flower and fruit many years before they attain their maximum size. The genus is much in need of study, and the smaller forms are included to stimulate a study of the genus, and in order that the larger forms may be more easily and certainly identified. The number of introduced trees has been limited to those that more or less freely escape at least in some parts of the State. The one exception is _Catalpa bignonioides_, which is given to help separate it from our native catalpa, both of which are now commonly planted.