VOL. Iv.] 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 glandulosa Lindl. San Pedro Martir. 
Rosa Californica ©. & S. San Pedro Martir. 
Rosa minutifolia 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. 
Amelanchier alnifolia Nutt. San Pedro Martir. 
FHeteromeles arbutifolia 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 serpyllifolius Gray. Common amongst rocks 
San Pedro Martir. 
Ribes sanguineum Pursh. San Pedro Martir. 
C:nothera biennis I,. San Pedro Martir. 
Megarrhiza Californica Torr. This is common at lower 
elevations and has been found far south of San Quentin. 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. 
Datisca glomerata B. & H. San Pedro Martir. 
Cereus pheniceus Engelm. grows on San Pedro Martir and 
has been found as far south as Comondu. 
Cereus gummosus Engelm. reaches to north of Ensenada, 
but the plants are dwarfed. ‘ 
Selinum capitellatum B. & H. Common on San Pedro 
Martir. 
