362 RYDBERG: NoTEs ON ROSACEAE 
SIBBALDIA, SIBBALDIOPSIS, AND DASIPHORA 
No essential change has been made in the treatment of these 
genera since the publication of my monograph of 1898. 
DRYMOCALLIS 
This genus is exceedingly perplexing as to its numerous and 
somewhat intergrading forms. It is by no means easy to draw 
specific lines. As represented in the eastern United States it js 
easily disposed of, as it is there represented by only one species, 
D. agrimonioides (Potentilla arguta Pursh). In the Rocky Moun- 
tain region there are at least nine forms which I have regarded as 
species, and these increase to about two dozen in the Pacific 
States. In the North American Flora there were admitted in 
all 28 species. Of these the following were proposed as new: 
Drymocallis corymbosa, D. foliosa, D. pumila, D. viscosa, D. 
arizonica, D. amplifolia, D. oregana, D. laxiflora, D. albida, and 
D. micropetala. Besides these, D. glandulosa monticola and D. 
glandulosa incisa were raised to specific rank and the name D. 
agrimonioides (Pursh) Rydb. was substituted for D. arguta (Pursh) 
ydb., as Geum agrimonioides both has page priority and was 
based on the typical form. 
Drymocallis corymbosa was described from specimens included 
in D. convallaria in my Flora of Montana. It differs from the 
original D. convallaria in the flat-topped instead of racemiform 
cyme, the rounded-obovate instead of rhombic-obovate leaflets, 
and the conspicuously long-hairy stem and petioles. 
It is common from Alberta to Colorado, Idaho, Washington, 
and British Columbia. 
Drymocallis foliosa was described from specimens which I had 
formerly determined doubtfully as D. glutinosa Rydb., i. e., D. 
valida (Greene) Piper. It is characterized by its large-leaved in- 
florescence and its rhombic-obovate coarsely and incisedly toothed 
leaflets. The following specimens belong to it: 
Montana: Bridger Mountains, 1896, Flodman 590. 
Wyom1nG: Buffalo Fork, 1897, Tweedy 214; Encampment, 1901, 
Tweedy 4148. 
Urau: Alta Mountains, 1899, M. E. Jones r108. 
