MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVERSITY itl 
The species is somewhat intermediate between P. nivea and P. pulcherrima, but differs 
from both by the more deeply dissected leaves and the terminal leaflet which is generally 
somewhat petiolate. Most of the basal leaves are 5-foliolate, but, as a rule, some as well 
as the stem leaves are only 3-foliolate. It has been regarded as a variety of P. nivea, but it 
is much better to consider it as a distinct species. I have held the opinion that it was a 
hybrid between P. pulcherrima and P. nivea or P. uniflora, but Professor J. Macoun, who 
has collected it at several stations, has written me that it has not been found together 
with either of these species. I haye found it in Montana at an altitude of 10,000 feet, 
where P. pulcherrima does not grow; I haye not found P. nivea in Montana. 
Saskatchewan: FE. Bourgeau, 1857-8. 
Alberta: John Macoun, No. 16721, 1897. 
Rocky Mountains (probably in Alberta): John Macoun, 1887; No. 1459, 1879; No. 
7294, 1891. 
British Columbia: John Macoun, No. 1460, 1875. 
Northwest Territory: John Macoun, No. 1467, 1881. 
Montana: Rydberg & Bessey, No. 4397, 1897. 
$11, OVALES. 
58. Potentilla ovalis Lehm. 
Potentilla ovalis Lehm. Ind. Sem. Hort. Bot. Hamb. 1849: 9. 1849. 
Lehm. Rey. Pot. 140; Hemsley, Biol. Cent. Am. 1: 376. 
Intustrations: Lehm. Rey. Pot. pl. 50. 
Perennial by a short rootstock ; stem low, 2-3-flowered, appressed-silky. Leaves ternate, rather 
thick, green and subglabrous above, white-silky beneath; leaflets oval, serrate, except at the base ; 
bractlets lanceolate, acute, much shorter than the three-toothed sepals. Petals obovate or nearly orbic- 
war, white, exceeding the sepals. 
The plant much resembles a Fragaria, especially an undeveloped F. Virginiana, but is easily dis- 
tinguished by the three-toothed sepals and the dry fruit. It is a native of Mexico. 
$12. FRIGIDAE, 
59. Potentilla flabellifolia Hook. 
Potentilla flabellifolia Hook. ; Torr. & Gray, Fl. N. Am. 1: 442. 1840. 
Dietr. Syn. Pl. 3: 183; Walp. Xep. 2: 34; Ann. 2: 505; Lehm. Rey. Bot. 153. 
Newberry, Pac. R. R. Rep. 6: Part 3, 72; Rydb. Bull. Torr. Bot. Club, 23: 306. 
Potentilla gelida Wats. Proc. Am. Acad. 8: 559. 1873. Not Meyer, 1831. 
Brewer & Watson, Bot. Cal. 1: 180; Rattan, An. Key W. Coast Bot. 51; Greene, 
Di rans 1363; 
