ILLUSTRATIONS 



Pignut. Fruiting Spray of {Carya porcina), 291 ; Fruiting Spray of {Carya vii- 



Rkii Birch, Brantli of, 296 ; Leaves of, 307 ; Strolailes 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 



Yellow 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, Anient of, 320; Fruiting Spray of, 321 



Scarlet Oak, Aments of, 324 ; Flo\\ers of, 325 



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



Post Oak, Leaves of, 233 ; 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, ^63 ; Variant Leaves of, 364; Acorns of, 364 



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



Bear 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, 373 ; Leaves of, 376 



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

 ters of, 3S0 ; Tree, 381 ; Trunk of, 385 



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 WilI-ow, Lea\'es 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, 42r, 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 



xix 



