488 Rydberg : Notes on Rosaceae 



Utah: Big Cottonwood Canon, 1905, Garrett 1614. 



Potent-ilia Elmeri resembles P. Pecten in habit but is silky, 

 not at all tomentose. It is represented by the following: 



California: Griffins, Ventura County, 1902, Rimer 4009; 

 Donner Lake, 1903, Heller. 



Potentilla subvillosa and P. comosa are very local and are 

 represented by the type collections only. 



Dr. Wolf in his monograph and Professor Aven Nelson in 

 the New Manual of Botany of the Central Rocky Mountains 

 unite Potentilla Bakeri and P. viridescens, and the former reduces 

 both to a variety of P. gracilis. P. viridescens is evidently related 

 to P. gracilis and differs in the characters presented by Dr. Wolf; 

 but P. Bakeri has the leaves dissected to near the midrib into 

 linear or linear-oblong and obtuse, not lanceolate and acute divi- 

 sions. P. Bakeri has spreading pubescence on the stem, and the 

 leaves are rather densely tomentose beneath. I have collected 

 Potentilla Bakeri myself in Utah and P. viridescens in Montana 

 and know that they both hold their characters well. Besides 

 the specimens cited by me in the original publication, the following 

 represent P. Bakeri: 



Utah: Wahsatch County, near Midway, 1905, Carlton & 

 Garrett 6721 and 6696; Juab, June 10, 1902, Goodding 1092; Big 

 Cottonwood Canon, Aug. 14, 1905, Garrett 1614; Hot Pots, 

 Wahsatch County, Garrett F726. 



Wyoming: Chug Creek, Albany Co., June 29, 1900, Aven 

 Nelson 7318 (not 7317, which is cited by Dr. Wolf under P. 

 gracilis viridescens) . 



Pectinisectae 



This group contains four species, of which Potentilla longiloba 

 is described as new. It resembles P. Blaschkeana in habit, but 

 the leaves are loosely villous-tomentose above. The following 

 specimens belong here: 



Montana: Lo Lo, May 29, 1897, Elrod and assistants no; 

 Gallatin Valley, near Bozeman, 1896, Flodman 563, in part. 



Washington: Pullman, June, 1903, Piper 4134. 



British Columbia: Near international boundary between 

 Kettle and Columbia rivers, June 25, 1902, Macoun 63901. 



Idaho: Clear Water, Spaulding. 



