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1. QUERCUS. Oax. 
Styles slender, elongated; nut tomentose within; cup-scales thin; leaves or 
ir lobes bristle- ee wood reddish. (Black oaks.) 
Acorns pene the second year. 
ves deciduous, ee deeply lobed. . Q. Kelloggii. 
ite evergreen, small, bright green and shiny beneath 
. Q. Wislizeni. 
Acorns developing the first year; leaves evergreen, aac beneath. 
3. Q. agrif 
Styles short, dilated; scales thickened on the back; leaves A bradley 
tipped; wood white. (White oaks.) 
Acorns developing the second year; cups very thick; nuts tomentose 
within; leaves evergreen, tomentose beneath. 
Leaves entire or spinose-toothed; branchlets not pee acorns 
rounded at apex. . chrysolepis. 
Leaves coarsely spinose-toothed, undulate; Seances rigid and 
divaricate; acorns pointed at apex . Q. Dunnit 
Acorns devcispice the first year; nut glabrous within. 
Leaves deciduous, more or less lobed; trees 
Leaves dark green ve deeply iebed or parted; cups deep; 
branchlets pendulou . Q. lobata. 
Leaves blue-green oe shallowly lobed; cups shallow; branch- 
lets not pendulous 7. Q. Douglasit. 
Leaves evergreen 
Tees; jess entire or shallowly lobed, not spinose-toothed. 
8. Q. Engelmanni. 
Shrubs; leaves usually more or less spinose-toothed. 
Leaves nearly or quite glabrous above; twigs rusty-pubes- 
cent. 
Cups saucer-shaped; scales thick and rounded on the 
back. 
ac 9. 
Cup a scales aie 0. ae. 
Leaves gray with a stellat ; twigs grayish- 
pubescent. Il. Q. Alvordiana. 
1. Quercus Ketiocem Newb. Pacif. R. Rep. 6: 28, f. 6. 1857. 
Quercus tinctoria californica Torr. Pacif. R. Rep. 4: 138. 1857. 
Quercus californica Cooper, Smiths. Rep. 261. 1858. 
Type locality: “South and north of San Francisco in the Coast 
Mountains,” and “between Fort Bedding: and Lassen’s Butte, 
Distribution: Southern Oregon southward through the Coast 
Ranges and the Sierra Nevada to San Pedro Martir, Lower Cali- 
fornia. In southern California the California black oak is con- 
fined to the coniferous forests of the mountains, and is a charac- 
teristic tree of the Transition Zone. 
