9. Leaves pinnately and usually deeply lobed with rounded lobes. 



1 1 . Acorns under % inch long, enclosed for Yz or more of its 



length in cup; leaves yellow-green, 3-7 inches long, usually 



shrubby; Rocky Mountain region north to Wyoming and 



Nevada Q. gambelii, Gambel Oak, p. 185. 



1 1 . Acorns % of an inch long or longer, enclosed for less than Vi 

 their length in cup; Pacific Coast species. 



12. Acorns 1-2 V4 inches long, slender; deep, cup-like bowl; 



leaves 2Vi-3 inches long; California 



Q. lobata, California White Oak, p. 187. 



12. Acorns %.— IV^ inches long, ovoid; very shallow cup. 

 13. Leaves dark yellow-green, 3-6 inches long; petioles 

 hairy, V^-l inch long; British Columbia to Cali- 

 fornia. . . .Q. garryana, Oregon White Oak, p. 187. 



13. Leaves blue-green, 2-4 inches long; shallowly 

 lobed to sinuately toothed to entire ; petioles woolly, 



V^-Vl inch long; California 



Q. douglasii. Blue Oak, p. 185. 



Chestnut Oaks (Eastern Trees) 



Fruit long-stalked (1—4 inches); leaves coarsely sinuate-toothed 



to shallowly lobed, with 6-8 pairs of veins 



Q. bicolor, Swamp White Oak, p. 191. 



Fruit short-stalked or sessile; leaves coarsely toothed. 

 2. Leaves with 9-17 pairs of veins; large trees. 



3. Leaves woolly below and dark green above at maturity; 

 acorn 1-1 Vi inches long, enclosed for Vs its length in thick 



cup Q. michauxii, Swamp Chestnut Oak, p. 189. 



3. Leaves more or less hairy below and yellow-green above; 

 acorn enclosed for Vz-Vi its length in thin cup. 

 4. Leaves with rounded teeth; acorn 1-1 Vi inches long; 



cup on short stalk {Vi-Vi inch long) 



Q. prinus, Chestnut Oak, p. 189. 



4. Leaves with sharp teeth; acorn Yi-l inch long; cup sessile 

 or nearly so. . . .Q. muehlenbergii, Chinkapin Oak, p. 191. 



2. Leaves with 3-8 pairs of veins and usually sharp teeth; acorn 

 Y^-^i inch long, enclosed for Yi its length in thick cup; shrubby 

 or rarely a small tree; Mass. to N. C. and west to Nebr. and 

 Texas Q. prinoides Willd., Dwarf Chinkapin Oak 



True Red Oaks 



California and Oregon species; leaves usually 7-lobed; scales of 



fruit cup loosely imbricated 



Q. kelloggii, California Black Oak, p. 201 



Eastern Species (not reaching the Rocky Mountain region). 



2. Leaves deeply lobed. 



3. Leaves white- to red-woolly below. 



4. Leaves usually 5-lobed, 2-5 inches long; Maine to North 

 Carolina and Kentucky Q. ilicifolia Wsmgenh., Bear Oak 



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