The Origin of the Desert Climax and Climate 107 



probably identical with a modern one, it facilitates comparison 

 and interpretation to employ the name of the existing repre- 

 sentative, and this plan is accordingly pursued. 



The stations from which Pleistocene fossils have been re- 

 corded in California are as follows: (i) Rancho La Brea, in the 

 suburbs of Los Angeles; (2) Carpinteria, near Santa Barbara; 

 (3) Santa Cruz Island, one of the Santa Barbara group; (4) San 

 Bruno, on the west shore of San Francisco Bay; (5) Tomales 

 Bay, not far north of the last-named. As would be expected, the 

 poorest collection is from the first locality and the richest from 

 the last, though edaphic conditions largely determine this for 

 the intermediate stations. The grouping below is approximately 

 into trees, shrubs, and herbs, though the limits of the first two 

 are far from precise. 



PLEISTOCENE 



Trees — 



Pinus tuberculata 

 Cupressus macrocarpa 

 Junipenis californica 

 Sambucus glauca 

 Qucrcus agrifolia 



Pinus muricata 

 Pinus radiata 

 Pinus remorata 

 Pinus sabiniana 

 Pseudotsuga taxifolia 

 Sequoia sempcrvircns 

 Cupressus goveniana 

 Juniperus californica 

 Quercus agrifolia 

 Umbellularia californica 

 Sambucus glauca 



Pinus remorata 

 Pseudotsuga taxifolia 

 Cupressus goveniana 

 Myrica californica 



Rancho La Brea 



Shrubs — 



Celtis mississippiensis 



Celtis reticulata 



Carpinteria 



Pirus rivularis ? 

 Arctostaphylus glauca 

 Ceanothus thyrsiflonis 

 Garrya elliptica 

 Rhus diversiloba 

 Eriodictyum californicum 

 Myrica californica 



Herbs— 

 Xanthium calvum 



Pteris aquilina 

 Chorizanthe pungens 

 Cymopterus litoralis 

 Corethrogyne filagini- 



folia ? 

 Xanthium calvum 

 Arceuthobium campy- 



lopodum 



Santa Cruz Island 



Arctostaphylus sp. 

 Ceanothus thyrsiflorus 

 Cornus pubescens 



Arceuthobium campy- 

 lopodum 



