HARTMAN MULTIMEDIA
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HARTMAN MULTIMEDIA
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Lying a few kilometers to the west of the Laguna
mountain escarpment, this area is of botanic interest.
The dominant community is the Jeffrey pine and Southern oak woodlands,
with extensive stands of chaparral and some valley grassland and meadow.
In this area several widespread California trees reach their southern
limits, including the California bay, Umbellularia californica, California black
oak, Quercus kelloggii, and the big-leaf maple, Acer macrophyllum.
The ponderosa pine, Pinus ponderosa, may also reach its southern limit
here. This is one of several
localities where Jeffrey pine, Pinus jeffreyi, is found hybridizing with the
Coulter pine, Pinus coulteri. Many
endemics occur in these mountains, including four rare species, Heuchera
brevistaminea, Limnanthes gracilis var. parishii, Linanthus orcuttii, and
Machaeranthera asteroides var. lagunensis. The animal population is characteristic of the various
communities. Among the larger
mammals are the coyote, Canis latrans, gray fox, Urocyon
cinereoargenteus,
and the bobcat, Lynx rufus. The topography is that of a gentle, rolling upland with
intermittent streams and several small lakes. These broad surfaces of low relief
may be the remnants of a once more extensive peneplain dislocated by block
faulting in the Quaternary. The
underlying rock is pre-Cenozoic, some of which, the Julian schist, may date to
the Paleozoic. Integrity: Much
of the area is in the heavily used Laguna Recreation Area, which includes a
number of Use: Education,
research, light recreation, present. Ref: Jahns,
Richard H. 1954.
Geology of the Peninsular Range Province, Southern California and Baja
California, in Geology of Southern California Bull. No. 170, California Division
of Wines, San Francisco. Zobel, Bruce, 1951.
The Natural Hybrid between Coulter and Jeffrey Pines.
Evolution Vol. 5, pp. 405-413. November 1975
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