86 RYDBERG: NOTES ON ROSACEAE 
the type nor any authentic material. ;The habit, judging from 
Lehmann’s plate, suggests, however, this group and is most like 
that of P. arizonica. 
_MULTIFIDAE 
This group, as treated in the North American Flora, contains 
16 species, of which P. paucijuga and P. lasiodonia are new. 
The former is probably most nearly related to P. pseudosericea, 
but the stem and petioles are silky-villous with spreading hairs, 
as in P. pulchella, and the inflorescence is open. I have seen 
no specimen except the type, which in habit resembles somewhat 
P. rubripes, but the styles are quite different and place the plant 
in this group. The type specimen is mounted on the same sheet 
with four specimens of P. propinqua. 
Potentilla lasiodonta was based on material distributed as 
P. pennsylvanica and P. strigosa. It has the broad leaflets of the 
former and the pubescence of the latter, but differs from both in 
the dense inflorescence, similar to that of certain species of Dry- 
mocallis,and in the numerous lanceolate divisions of the leaflets. 
These number 15-21, while in P. pennsylvanica and P. strigosa 
there are 9-13. The following specimens belong here: 
ALBERTA: Calgary, July 21, 1897, Macoun 16716. 
SASKATCHEWAN: Tramping Lake, Aug. 4, 1906, Macoun & 
Herriot 698ro. 
MANITOBA: Rapid City, 1896, Macoun 12576. 
The MULTIFIDAE are one of the most difficult groups of the 
North American species of Potentilla. The difficulty is to draw 
lines between species. A conservative botanist might admit 
but four or five species, viz., P. pulchella,.P. bipinnatifida, P. mul- 
tifida, and P. pennsylvanica, and maybe P. virgulata. Nelson, 
in the New Manual of the Central Rocky Mountains, admits 
P. bipinnatifida Dougl. (which he, however, has renamed P. pin- 
natifida Dougl.), P. pennsylvanica with two varieties, P. atro- 
virens, and P. virgulata. P. pseudosericea, he makes a synonym 
of “P. pinnatifida.”” P. pulchella, P. multifida, and their allies 
are not found in the Rocky Mountain region. Dr. Wolf admits 
P. pulchella, P. pseudosericea, P. bipinnatifida, P. multifida, P. lit- 
oralis, P. pennsylvanica, and P. glabrella. Note the differences of 
opinion. Nelson regards P. atrovirens and P. virgulata as good 
