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. betulaefolius, 
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. fothergilloides 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 Carirornia: Nachaguere Valley, 1894, Schoenfeldt 
3432 and Mearns 3300. 
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: 
CaLirornia: Los Angeles County, 1901, Grant 3488; 1850, 
i. C. Parry; 1890, H. E. Hasse. 
Lower Catrornia: mountains, 1882, Pringle. 
