VOL. iv.J Southern Extension of California Flora. 205- 



taken not only in their number but in the character of the 

 filaments. 



Potentilla Wheeleri Watson. Growing on cliffs at dry, high 

 elevations of San Pedro Martir. The plants are much larger 

 than the original specimens and are very fragrant and somewhat 

 glandular. 



Potentilla glandidosa L,indl. San Pedro Martir. 



Rosa Calif ornica C. & S. San Pedro Martir. 



Rosa ininiitifolia Engelm. Abundant near the coast from 

 north of Ensenada to below El Rosario. It extends into the 

 interior a dozen or more miles from the Pacific slope. In some 

 localities most of the bushes produce white flowers. 



Amelaiichier ahiifolia Nutt. San Pedro Martir. 



Heteromeles arbiitifolia Roem. Growing along streams about 

 the foothills of San Pedro Martir. This bush does not seem to 

 have been found between here and the mountains of the Cap^ 

 Region. 



Heuchera rubescens Torr. San Pedro Martir. 



Philadelphus serpy llifolius Gray. Common amongst rocks 

 San Pedro Martir. 



Ribes sang nine um Pursh. San Pedro Martir. 



CEnothera biennis L. San Pedro Martir. 



Megarrhiza Californica Torr. This is common at lower 

 elevations and has been found far south of San Ouentin. Speci- 

 mens of variations in the shape and outline of the leaf were col- 

 lected from one locality — they show all degrees of lobing between 

 entire and divided nearly to the centre. This leaf variation is 

 common in western species of Echinocystis and characters 

 based on forms of the leaf evidently have no value. 



D alls ca g lorn erata B. & H. San Pedro Martir. 



Cerens phoenicens Engelm. grows on San Pedro Martir and 

 has been found as far south as Comondu. 



Cereus gumniosus Engelm. reaches to north of Ensenada, 

 but the plants are dwarfed. 



Selinum capilellatuni B. & H. Common on San Pedro 

 Martir. 



