30 University of California Puhlications. [botany 



higlier than the principal ones of Tahqnitz Valley and well 

 within the Canadian Zone, while the latter l^elong to the Upper 

 Transition Zone. 



We also find in Round Valley a number of small meadows 

 which are on somewhat higher and therefore better drained soil 

 than the one just described. These are composed entirely of the 

 true grasses, Ehjnms glaucus, Bromus marginafus seniiiiKdiis and 

 SporohoJns depauperaius being the most important. 



There are a number of plants other than grasses, sedges, etc., 

 which find the conditions existing in the wet meadows of the 

 higher valleys favorable to theii* growth. Since the soil in 

 which they grow contains a large percentage of water, the,y take 

 on a somewhat hydrophilous character, notwithstanding the fact 

 that they are subjected to the di-ying effect of the direct rays of 

 the sun. Of these plants the two most characteristic are Polyg- 

 onum historioides and Dodecatheon aljiinum; the former being 

 common around the borders of meadows, where its white heads 

 are quite showy during the flowering season, while the latter 

 often dots the more boggy portions with reddish purple. 

 Other species apparently restricted to this habitat are Enlophns 

 ParisJm, Veronica serpyUi folia, Epilohimn Oregonense gracil- 

 linmm, and Aster Andersonii. Trifolium Rushyi forms a sod in 

 one or two places in Tahqnitz Valley, and T. monantlmm is 

 abundant around the borders of the Carex meadows of Round 

 Valley, and elsewhere. 



THE RIPARIAN FORMATION. 



The riparian formation on San Jacinto Mountain is not a 

 prominent one. The streams usually flow through canons or 

 valleys whose sides rise, either gradually or abruptly, from the 

 very water' s-edge, leaving scarcely room for a strip of saturated 

 soil such as is common along streams of the lowlands. In some 

 of the larger valleys, however, the flora of the stream banks 

 becomes quite conspicuous. 



In Strawbeny and Onstatt Valleys the streams are lined with 

 a growth of White Alder ( Alnus rhomhi folia) and two species of 

 willow fSalix lasiolepis and S. laevigata). In the canons the 

 Western Azalea (Rhododendron occidentalej is found adorning 



