Quercus agrifolia  Nee

Ubiquity:  Very common

Distritution:  Throughout except Napa Marsh

Plant Communities:  Many, including Serpentine Chaparral

Habitats:  Dry or moist, sunny, rocky, ultramafic or not slopes/summits/flats/canyons/valley floors; in riparian places like streamsides or banks; in all geologic formations including serpentine

Elevations:  10-2500'

Comments:  Hybridizes freely with Q. wislizenii & with Q. kelloggii

Updated:  2/3/98

Quercus agrifolia x kelloggii

Ubiquity:  Very uncommon

Distritution:  Reported only on Monticello Rd. (Capell Valley Quad.) & Sugarloaf Peak (Mt. George Quad.)

Plant Communities:  Blue Oak Woodland

Habitats:  A dry, sunny, rocky, wooded summit; on a volcanic formation

Elevations:  700-1100'

Comments:  Collection needed.  = Q. x chasei McMinn

Updated:  2/3/98

Quercus berberidifolia x durata

Ubiquity:  Very uncommon

Distritution:  Seen at Four Corners, Bothe State Park, Oat Hill Mine Rd.

Plant Communities:  Regular Chaparral

Habitats:  Dry, sunny, rocky, brushy slopes & flats; in volcanic formations

Elevations:  

Comments:  Collection needed

Updated:  2/3/98

Quercus berberidifolia x garryana

Ubiquity:  Very uncommon

Distritution:  Seen only at Bothe State Park

Plant Communities:  Blue Oak Woodland

Habitats:  Dry, sunny, rocky, wooded roadside; in a volcanic formation

Elevations:  800'

Comments:  Collection needed.  = Q. x howellii

Updated:  2/3/98

Quercus chrysolepis  Liebm.

Ubiquity:  Very common

Distritution:  Throughout except Napa Marsh

Plant Communities:  Knobcone & Mixed Evergreen Forests, Blue Oak Woodland, Regular Chaparral

Habitats:  Dry, sunny or partially-shaded, rocky, forested or wooded slopes/summits/flats; in volcanic & sedimentary formations

Elevations:  500-2700'

Comments:  

Updated:  2/3/98

Quercus douglasii  H. & A.

Ubiquity:  Very common

Distritution:  Throughout except Napa Marsh

Plant Communities:  Blue Oak Woodland

Habitats:  Dry, sunny, often rocky or shaley, wooded slopes/summits/flats/foothills; in most geologic formations but atypically on serpentine

Elevations:  120-2250'

Comments:  Hybridizes with Q. lobata, garryana

Updated:  2/3/98

Quercus douglasii x garryana

Ubiquity:  Very uncommon

Distritution:  ?

Plant Communities:  ?

Habitats:  ?

Elevations:  ?

Comments:  = Q. x eplingii  C. H. Mull.

Updated:  2/18/98

Quercus douglasii x lobata

Ubiquity:  Very uncommon

Distritution:  Seen only at Wantrup Wildlife Refuge in Pope Valley & in Chiles Valley

Plant Communities:  Blue Oak Woodland, Valley Oak Riparian

Habitats:  Dry, sunny, rocky or clayey, wooded flat & creekside; on a sedimentary & a serpentine(?) formation

Elevations:  

Comments:  

Updated:  2/3/98

Quercus durata  Jeps.

Ubiquity:  Very common in serpentine areas

Distritution:  N1/2 & SE1/4

Plant Communities:  Serpentine Chaparral

Habitats:  Dry, sunny, rocky, ultramafic, brushy slopes/summits/flats; in serpentine formations

Elevations:  350-2500'

Comments:  Hybridizes with Q. berberidifolia & garryana

Updated:  2/3/98

Quercus garryana  Dougl.

Ubiquity:  Very uncommon

Distritution:  Known only from Petrified Forest Rd. to Mt. Veeder; reported on Howell Mt.

Plant Communities:  Oregon Oak Woodland, Mixed Evergreen Forest

Habitats:  Dry, sunny, rocky, wooded or forested slopes/summits/flats; on volcanic formations

Elevations:  ?-1750'

Comments:  Hybridizes with Q. berberidifolia, douglasii, durata, & lobata.  Report in Napa Marsh on a dike highly questionable

Updated:  2/3/98

Quercus kelloggii  Newb.

Ubiquity:  Very common

Distritution:  Throughout except Napa Marsh

Plant Communities:  Mixed Evergreen Forest, Blue Oak Woodland, occasionally Valley Oak Riparian

Habitats:  Dry, sunny, rocky, ultramafic(?), forested or wooded slopes/summits/flats/streambanks; on most geologic formations but atypically on serpentine

Elevations:  220-2500'

Comments:  Confirmation on serpentine needed.  Hybridizes with Q. agrifolia & wislizenii

Updated:  2/3/98

Quercus kelloggii x wislizenii

Ubiquity:  Uncommon

Distritution:  Throughout except Napa Marsh

Plant Communities:  Blue Oak Woodland, Regular Chaparral

Habitats:  Dry, sunny, rocky or shaley, wooded or brushy summits/slopes/canyons; in volcanic & sedimenatry formations

Elevations:  200-2600'

Comments:  = Q. morehus  Kell.

Updated:  2/3/98

Quercus lobata  Nee

Ubiquity:  Very common

Distritution:  Throughout except Napa Marsh

Plant Communities:  Valley Oak Woodland, Valley Oak Riparian, Blue Oak Woodland

Habitats:  Dry, sunny, clayey, wooded slopes/flats/valley floors/streamsides & banks; in all geologic formations, but atypically on serpentine

Elevations:  10-2100'

Comments:  Hybridizes with Q. douglasii, berberidifolia, garryana

Updated:  2/3/98

Quercus wislizenii  A. DC.

Ubiquity:  Very common

Distritution:  Throughout except Napa Marsh

Plant Communities:  Blue Oak Woodland, Regular Chaparral

Habitats:  Dry, sunny, rocky or shaley, wooded or brushy slopes/flats/valley floors; in most geologic formations except serpentine

Elevations:  100-2500'

Comments:  Hybridizes freely with Q. agrifolia & less so with Q. kelloggii

Updated:  2/3/98

Quercus wislizenii  A. DC.  var. frutescens  A. DC.

Ubiquity:  Uncommon

Distritution:  NW1/4 & S1/2 excluding Napa Marsh

Plant Communities:  Regular Chaparral

Habitats:  Dry, sunny, rocky, brushy slopes/flats/valley floors; in volcanic & sedimentary formations

Elevations:  350-2500'

Comments:  

Updated:  2/3/98