MKMOIES FROM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVERSITY 77 



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 have found it in Montana at an altitude of 10,000 feet, 

 where P. pulcherrima does not grow ; I have not found P. nivea in Montana. 



Saskatchewan: E. 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. 



Northivest Territory: John Macoun, No. 1467, 1881. 



Montana: Rydberg & Bessey, No. 4397, 1897. 



§ II. OVALES. 

 58. Potentilla ovalis Lehm. 



Potentilla ovalis Lehm. Ind. Sem. Hort. Bot. Hamb. 1849: 9. 1849. 



Lehm. Eev. Pot. 140 ; Hemsley, Biol. Cent. Am. 1 : 376. 



Illustrations : Lehm. Rev. Pot. pi. BO. 



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- 

 ular, 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 flabellif alia Hook. ; Torr. & Gray, Fl. N. Am. 1 : 442. 1840. 

 Dietr. Syn. PI. 3: 183; Walp. Rep. 2: 34; Ann. 2: 505; Lehm. Eev. 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, 

 Fl. Fran. 1 : 63. 



