Rydberg: Notes on Rosaceae 499 



also specimens collected by Douglas in California. The latter 

 were the base of the description and figure in Hooker's Icones, 

 plate 323. It is a question whether Hooker & Arnott did not have 

 Douglas's specimens in mind when they drew the description of 

 C. parvifolius. It would, therefore, be some doubt as to which the 

 name C. parvifolius should be applied, the low shrub of the Rocky 

 Mountains or the more tree-like one from southern and central 

 California. Sargent referred both to C. parvifolius, while C. K. 

 Schneider, who without question has done the best and most 

 critical work on the genus, referred the latter to C. betulaefoliusj 

 yes, even made it the "var. typicus" of that species. Schneider 

 laid more stress on the form and size of the teeth of the leaves and 

 in this respect Douglas's plant is more like C. betuloides. If the 

 pubescence and leaf-form are considered, it resembles more the 

 plant of the Rockies. As said before, it is doubtful which of the 

 two should be regarded as C. parvifolius. As Nuttall's plant is 

 included in the original description it must be regarded as the 

 type, but unfortunately, or rather fortunately, it (i. e. the Rocky 

 Mountain shrub) had already a name, C. montanus Raf., based 

 on C. f other gilloides Torrey, not that of Humboldt, Bonpland and 

 Kunth; and C. parvifolius becomes a synonym. Hence the more 

 tree-like species of California, represented by Douglas's specimens, 

 was left without a name, and the writer proposed the name C. 

 Douglasii in the North American Flora. 



Cercocarpus Douglasii Rydb. See the discussion above. Of 

 this species I have seen many specimens. They are all from 

 California, except the following: 



Arizona: Jucumba Hot Springs, 1894, Schoenfeldt 335. 



Lower California: Nachaguere Valley, 1894, Schoenfeldt 

 3432 and Mearns 3390. 



Cercocarpus rotundifolius Rydb. This is related to the pre- 

 ceding species, but differs in the small broad rounded-oval leaves; 

 in C. Douglasii the leaves are obovate or oblanceolate, distinctly 

 cuneate at the base. To C. rotundifolius belongs the following 

 specimens : 



California: Los Angeles County, 1901, Grant 3488; 1850, 

 C. C. Parry; 1890, H. E. Hasse. 



Lower California: mountains, 1882, Pringle. 



