PLANTS OF THE SAN BERNARDINO MOUNTAINS 169 



mixed conifers, the dominant tree being Pinus ponderosa; in 

 the Lower subzone are found Cornus Nuttallii, C. californica and 

 Quercus Kelloggii and in the Upper Juniperus occidentalis, 

 Cercocarpus ledifolius and Ceanothus cordulatus. At about 7000 

 feet begins the Canadian Zone, with Pinus murrayana as its 

 index, and at about 9000 to 10000 feet this merges into the 

 Hudsonian, which extends nearly to the suminit of San Gorgonio, 

 and is indicated by the presence of Pinus fiexilis. These two 

 zones are much confused, and their hmits poorly understood. 

 Finally at the very summit of San Gorgonio is a feeble repre- 

 sentation of the Arctic-Alpine flora. 



In the following catalogue the term "zone" is used for con- 

 venience to denote areas of unequal phytogeographical value. 

 But few common names are given, for the reason that but few 

 are in popular use, and the function of the botanist is not to 

 pro\dde such names, but to record those actually in general use. 



CATALOGUE 



OPHIOGLOSSACEAE 



Botnjckium simplex E. Hitchc. Am. Journ. Sci. 6: 103. 



In a canon of South Mountain, Mill Creek, G. R. Robertson, and Big Mead- 

 ows, Hall, both in the Canadian Zone; but few plants in either place. 



POLYtODIACEAE 



Polypodium vulgare Linn. var. hesperium Nels. & Macbr. Bot. Gaz. 61: 30. 



In rock crevices in the Hudsonian Zone. 

 Polypodium californicum Kaulf. Enum. Fil. 102. 



Abundant in shaded rock crevices in the Lower Chaparral Zone. 

 Gymnogramma triangularis Kaulf. Enum. Fil. 75. Gold Fern 



Abundant in shaded gravelly or stony soil in the Lower Chaparral Zone. 

 Only the yellow-powdered form is found. 

 Notholaena tenera Gillies, Bot. Mag. t. 305. 



A few plants only, in rock crevices in Cushenberry Canon and Water 

 Canon, both in the Lower Pinon Zone. 

 Adiantum capillus-veneris Linn. Sp. PL 1096. Maidenhair Fern 



Occasional on the face of shaded dripping cliffs in the Lower Chaparral 

 Zone. 

 Adiantum pedatum Linn. Sp. PI. 1095. 



Snow Canon, an Hudsonian island of Mill Creek Canon. 



