TABLE 1.--RELATIONS OF THE MAJOR ENVIRONMENTAL CATEGORIES OF THE SAN GABRIEL MOUNTAINS. ======================================================================= Biotic province | Plant community | Life-zone | Slope ----------------+--------------------------+-----------------+--------- |1. Coastal sage scrub | Lower Sonoran | Pacific Californian |2. Southern oak woodland | Upper Sonoran | Pacific |3. Chaparral | Upper Sonoran | Pacific ----------------+--------------------------+-----------------+--------- Sierran |4. Yellow pine forest and | Transition | Pacific | limited areas of | Canadian | and | boreal flora | | Desert ----------------+--------------------------+-----------------+--------- Nevadan |5. Sagebrush scrub | Transition | Desert | | Upper Sonoran | ----------------+--------------------------+-----------------+--------- Southern Desert |6. Pinyon-juniper woodland| Upper Sonoran | Desert |7. Joshua tree woodland | Lower Sonoran | Desert ----------------+--------------------------+-----------------+--------- The Californian Biotic Province dominates the biotic aspect of the coastal slope of the range. Thirty-nine out of the seventy-two mammals recorded from the San Gabriels are typical of this Province. The coastal sage-flats at the Pacific base of the mountains and the vast tracts of chaparral of the coastal slope are included in this Province. Forming a hiatus between the Pacific and the desert slope is the Sierran Biotic Province consisting of coniferous forests on the crest of the range. The chipmunk (_Eutamias speciosus speciosus_) and the introduced black bear (_Ursus americanus californiensis_) are the only two mammals which can be considered typical of this area. On the higher peaks of the range, such as Mount San Antonio and Mount Baden Powell, the Canadian Life-zone is represented by certain boreal plants. At scattered points along the crest of the range and on the desert slope, the Nevadan Biotic Province is represented by the sagebrush scrub association. No mammals can be considered typical of this region. The Southern Desert Biotic Province occurs below 6000 feet elevation on the interior slope of the range, and markedly influences the mammal fauna of this slope. Twenty-one species of mammals are typical of this Province. SCIENTIFIC AND COMMON NAMES OF PLANTS MENTIONED IN THIS REPORT