58 The New York State College of Forestry 



LEAF KEY TO THE SPECIES — (Continued) page 



73. Leaves with scattered stellate hairs above, rusty pubescent beneath; upper 



leaf-lobes usually cruciate Quercus stellata 177 



73. Leaves glabrous or pilose above, white pubescent or tomentose below ; terminal 



leaf-lobe much the larger 74 



74. Leaves pale or somewhat downy beneath Quercus macrocarpa 179 



74. Leaves white-hoary beneath Quercus bicolor LSI 



75. Leaves prevailingly linear-lanceolate and narrowly ovate to oblong, narrowly 



obovate or spatulate 76 



75. Leaves prevaiHngly ovate, oval, eUiptical or broadly obovate 98 



76. Leaves coarsely serrate or coarsely sinuate-crenate 77 



76. Leaves finely serrate, crenate, or sub-entire 79 



77. Teeth acute 78 



77. Teeth obtuse Quercus Prinus 185 



78. Leaf-blade thin, smooth beneath; petioles stout, about \ inch long 



Castanea dentata 173 

 78. Leaf-blade thick, pale silvery-pubescent beneath; petioles slender, \-\\ 



inches long Quercus Muhlenbergii 183 



79. Leaf-margin subentire or faintly toothed 80 



79. Leaf-margin distinctly toothed 83 



80. Leaves minutely downy and rugose veined above Salix rostrata 123 



80. Leaves glabrous above, not rugose- veined 81 



81. Leaves linear-lanceolate to linear-oblong, elhptic or narrowly obovate; leaf- 

 margin revolute 82 



81. Leaves oblanceolate to spatulate; leaf-margin not revolute. . .Salix purpurea 125 



82. Leaves pale white-glaucous beneath; apex acute Salix discolor 121 



82. Leaves pale green and generally smooth beneath; apex bristle-tipped. . . 



Quercus phellos 199 



83. Leaves glaucous or white-hairy beneath 84 



83. Leaves not whitened beneath, glabrous or pubescent 89 



84. Leaves pubescent beneath 85 



84. Leaves glabrous beneath 86 



85. Leaves rugose-veined above; margin remotely serrate Salix rostrata 123 



85. Leaves not rugose-veined above; margin finely serrate 



Salix alba, var. viteUina 117 



86. Leaf margin irregularly crenate-serrate, revolute Salix discolor 121 



86. Leaf margin finely serrate, not revolute 87 



87. Leaves thin ; apex long attenuate 88 



87. Leaves semi-coriaceous; apex acute or acuminate Salix fragilis 1 15 



88. Petioles glandular above, inserted obliquely, generally ^ inch or less in 



length Salix babylonica 119 



88. Petioles not glandular, widely divergent, generally ^ inch or more in 



length Salix amygdaloides 109 



89. Leaves rugose-veined above; margin revolute Salix rostrata 123 



89. Leaves not rugose-veined above; margin not revolute 90 



90. Leaves coriaceous, very lustrous and appearing as though varnished. .91 



90. Leaves membranous to thick, dull or somewhat lustrous 92 



91. Leaves ovate, oblong-ovate, or obovate; apex acute Sahx pentandra HI 



91. Leaves lanceolate to ovate-lanceolate; apex attenuate Sahx lucida 113 



92. Leaf-margin doubly serrate 93 



92. Leaf-margin serrate or crenate-serrate 94 



93. Leaves oblanceolate to obovate, with acute apex and tapering base 



Prunus instititia 251 

 93. Leaves elliptical to narrowly obovate, with acuminate apex and acute or 



rounded base Prunus americana 261 



94. Leaf-margin irregularly serrate Prunus Cerasus 257 



94. Leaf-margin regularly serrate 95 



95. Leaf-blade tapering at the base Prunus Persica 265 



95. Leaf-blade rounded or obtu.se at the base 96 



96. Leaves f-lj inches wide; petioles § inch or more in length 97 



96. Leaves \-\ inches wide; petioles less than I inch in length. .Salix nigra 107 

 97. Leaves oblong-lanceolate, thin-textured Prunus pennsylvanica 249 



