io8 



E E. Clements 



Trees — 



Pseudotsuga taxifolia 

 Sambucus glauca 



Pseudotsuga taxifolia 

 Picea sitchensis 

 Torreya californica 

 Pinus muricata 

 Pinus radiata 

 Cupressus goveniana 

 Acer macrophyllum 

 Ainus rubra 

 Arbutus menziesi 

 Quercus agrifolia 

 Umbellularia californica 

 Myrica californica 

 Sambucus glauca 



PLEISTOCENE 

 {Continued) 



San Bruno 



Shrubs — 



Ceanothus thyrsiflorus 

 Rhus diversiloba 

 Symphoricapus albus 

 Rubus parviflorus 

 Baccharis pilularis 

 Prunus emarginata 



TOMALES 



Arctostaphylus Colum- 

 biana ? 



Ceanothus thyrsiflorus 



Ceanothus rigidus 



Garrya elliptica 



Baccharis pilularis 



Adenostoma fasciculatum 



Rhus diversiloba 



Amelanchier alnifolia 



Cornus californica 



Corylus rostrata cali- 

 fornica 



Prunus emarginata 



Prunus subcordata 



Rubus parviflorus 



Rubus spectabilis 



Rubus vitifolius 



Symphoricarpus albus 



Vaccinium ovatum 



Arctostaphylus uva-ursi 



Herbs— 



Micromeria chamissonis 



Galium sp. 



Silenc sp. 



Montia perfoliata 



Hemizonia virgata 



Rumex salicifolius 



Rumex persicarioidcs 



Equisetum sp. 



Carex sp. 



Sparganium eurycarpum 



Pteris aquilina 

 Fragaria californica 

 Montia perfoliata 

 Galium californicum 

 Eriophyllum s. artemisi- 



folium 

 Calandrinia caulesccns 

 Atriplex hastata 

 Daucus pusillus 

 Camassia leichtlini 

 Rumex salicifolius 

 Rumex occidentalis 

 Rumex maritimus 

 Carex spp. 

 Scirpus spp. 

 Montia howelli 

 Montia sibirica 

 Montia fontana 

 Oenanthe sarmentosa 

 Ruppia maritima 

 Arceuthobium campy- 



lopodum ? 

 Datisca glomerata 



A detailed consideration o£ the significance o£ the species in 

 each flora and of the cHmatic impHcations of the flora has been 

 given by the several authors, namely, Frost (1927), Chaney and 

 Mason (1933, 1930), Potbury (1932), and Mason (1934). For 



