4. 



*]2 OAK FAMILY 



the rim of Yosemite Valley and on all the higher mountains. 

 The bark is light-colored and the twigs glabrous. 



3. Q. wislizenii DC. Interior Live Oak. Leaves rigid, 

 oblong to ovate, entire or spiny-toothed, 1 to 

 2^2 in. long, green and shining above, yellow- 

 ish green beneath. Acorns cylindric to conic, 

 acute, 1% to \ l / 2 in. long, in reddish-brown 

 cups. — A small, round-headed tree with 

 smooth, black bark becoming fissured only 

 on large trunks. Belongs to the foothills but 

 reaches 3400 ft. in the Merced Canon. 

 Q. kelloggii Newb. California Black Oak. Leaves 

 thin, broad, deeply parted, each 

 of the several lobes with 1 to 3 

 or more coarse bristle-tipped 

 teeth, 3 to 8 in. long, 2 to 5 in. 

 wide, green and shining above, 

 lighter beneath. Acorns oblong, 

 obtuse, 1 to 1*4 m - long, deeply 

 set in a cup ^ to 1 in. deep. 

 (Q. calif ornica Cooper.) 



Our Black Oak is a graceful, 

 deciduous tree, 30 to 80 ft. high, 

 with broad, rounded crown and 

 dark bark checked into small 

 plates. It inhabits valley floors 

 and benches of the Yellow Pine 

 Belt, becoming dwarfed and 

 shrubby at 7000 ft. alt. Q. more- 

 hus Kell., which is probably a 

 hybrid between this and Q. 

 wislizenii, occurs at El Portal. It 

 has shallowly lobed leaves, the 

 lobes pointing upward, and its cups are similar to those of 

 Q. wislizenii. 



Q. breweri Engelm., the Brewer Oak, and Q. dumosa Nutt., 

 the Scrub Oak, have been reported from the Yosemite but 

 without specimens. The former is a shrub with round-lobed 

 leaves; the latter, which is a foothill shrub, has leaves either 

 entire or spiny-toothed. 



2. CASTANEA. Chestnut. 

 1. C. sempervirens Kell. Bush Chinquapin. Leaves ob- 

 long or lanceolate-oblong, narrowed at base, obtuse, lj4 to 3 



