ILLUSTRATIONS 



Pignut, Fruiting Spray of [Carya porcina), 291 ; Fruiting Spray of \Carya ?ni- 

 crocarpa)^ 293 



Red Birch, Brancli of, 296; Leaves of, 307 ; Stroiiiles of, 308 



Sweet Birch, Aments of, 296 ; Strobiles of, 312 ; Leaves of, 313 



Paper Birch, Strobiles of, 302 ; Fruiting Sprays of, 303 ; Trunk of, 305 



Yel,low Birch, Scales of, 297 ; Leaves of, 309 ; Strobiles of, 310 



White Birch, Strobiles of, 298 ; Fruiting Branch of, 299 ; Trunk of 301 



Alder, Fruiting Spray of, 315 



Hop Hornbeam, Branch of 316 ; Fruiting Spray of, 317 ; Aments of, 318 



Hornbeam, Ament of, 320; Fruiting Spray of, 321 



Scarlet Oak, Aments of, 324 ; Flowers of, 325 



White Oak, Leaf of, 327 ; Trunk of, 329; Fruiting Spray of, 331 



Post Oak, Leaves of, 333 ; Acorn of, 334 



Bur Oak, Acorn of, 336 ; Leaf of, 337 



Chestnut Oak, Leaves of, 339 ; Acorn of, 340 ; Trunk of, 341 



Yellow Oak, Leaves of, 343 ; Acorn of 344 



Chinquapin Oak, Leaves of, 345; Acorn of, 346 



Swamp White Oak, Leaves of 347 ; Acorn of, 348 



Red Oak, Leaves of, 350, 351 ; Trunk of, 353; Acorn of, 354 



Scarlet Oak, Aments of, 324 ; Flowers of, 325 ; Leaves of, 355 ; Acorn of, 357 



Black Oak, Leaves of, 359, 361 ; Acorn of, 362 



Spanish Oak, Leaves of, 363 ; Variant Leaves of, 364 ; Acorns of, 364 



Pin Oak, Acorn of, 366; Leaves of, 367 



Beak Oak, Acorn of, 368 ; Leaves of, 369 



Black Jack, Leaves of, 371 ; Acorn of, 372 



Shingle Oak, Leaves of, 373 ; Acorn of. 374 



Willow Oak, Acorn of, 375 ; Leaves of, 376 



Beech, Leaves of, 378 ; Fruiting Spray of, 379; Flowers of, 380; Flower Clus- 

 ters of, 380 ; Tree, 381 ; Trunk of, 383 



Chestnut, Leaf of, 387; Burs of, 389 ; Trunk of 391 



Willow, Flowers of, 394 



Black Willow, Staminate Flower of, 396; Pistillate Flower of, 396; Leaves 



of, 397 



Peach Willow, Leaves of. 398 



Shining Willow, Leaves of, 399 



Longleaf Willow, Leaf of, 400 



Bebb Willow, Leaves of, 402 



Glaucous Willow, Leaves of, 404 



White Willow, Leaves of, 406 



Crack Willow, Leaves of, 407 



Weeping Willow, Leaves of, 411 



Aspen, Flowers of, 413 ; Leaves of, 415 



Large-toothed Aspen, Leaf of, 417 ; Fruiting Ament of, 417 



Swamp Cottonwood, Leaf of, 420; Fruiting Ament of, 420 



Balsam, Leaves of, 421, 423 ; Flowers of, 424 ; Fruiting Ament of, 424 



Cottonwood, Leaves of, 427 ; Winter Branch of, 426 ; Trunk of, 425 ; Stam- 

 inate Aments of, 412 ; Pistillate Aments of, 412 



White Poplar, Leaves of, 429 ; Aments of, 431, 433 



