342 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Range: Alaska to Labrador, southward to California, New Jersc}', and New Mexico. 

 Europe. Asia. 



Specimens ex.\mined: Cascade Mountains to Colviile, Lyall in 1860; without locality, 

 Vasey 316; Mission, Kreager 490; Wenache Mountains, Cotton I65I3. 



Zonal distribution: Canadian^ 



la. Dasiphora fruticosa tenuifolia (Willd.) Rydberg, Mon. N. A. Pot. ISO. 1898. 



Poientilla tenuifolia Willd.; Schlecht. Mag. Ges. Naturf. Freunde Berlin 7: 28.5. 1813. 



PotentUIa fruticosa ienuifolia Lehm. Monog. Pot. 20 1820. 



Type locality: "Aus Sibirien." 



Range: Same as of the preceding. 



Specimens examined: Olympic Mountains, Grant in 1889; Mount Rainier, Piper 1997; 

 Wenache Mountains, Elmer 162: Horseshoe Basin, Lake (t Hull 519. 



Zonal distribution: Iludsonian. 



DHYMOCALLIS. 



Style filiform, more than twice as long as the akcnes 1 . D. rhoniboidea. 



Style filiform, less than twice as long as the akenes. 

 Flowers cream-color. 



Stems 20 to 50 cm. high ; alpine plant 2. D. ff^eudornpestris. 



Stems 30 to 100 cm. high ; lowland plant 3. D. eonvallaria. 



Flowers yellow. 



Sepals broadly ovate 7. D. mrangeliana. 



Sepals lanceolate to ovate. 



Herbage nearly glabrous 6. D. glahrala. 



Herbage very glandular. 



Petals much larger than the sepals 4. D. valida. 



Petals scarcely larger than the sepals 5. D. glandulosa. 



1. Drymocallis rhomboidea Rydberg, Mon. X. A. Pot. 203. 1898. 

 Poteniilla rhomboidea Rydberg, Bull. Torr. Club 23: 248. 1896. 

 Type locality: Nevada. Collected by Wat.son. 



Range: Washington to Montana, Nevada, and Oregon. 

 Specimens examined: Mount Adams, Si/A:sfZo// 119; Fleff \332. 



2. Drymocallis pseudorupestris Rydberg, Mon. N. A. Pot. 194. 1898. 

 Poientilla pseudorupestris Rydberg, Bull. Torr. Clab 24: 250. 1897. 



Poteniilla glandulosa nevadensis S. Wats, in Brewer & Wats. Bot. Cal. 1: 178. 1876, not 

 P. nevadensis Boiss. ^ 



Type locality: Little Belt Mountains, Montana. 

 Range: Alberta to Washington and California. 

 Specimens examined: Klickitat County, i57/ts(Zo// in 1885. 

 This suppo.sed species seems to me quite identical with the Old World Potent ilia rupestt is L. 



3. Drymocallis eonvallaria Rydberg, Mon. N. A. Pot. 193. 1898. 

 Poientilla eonvallaria Rydberg, Bull. Torr. Club 24: 249. 1897. 

 Type locality: Bozeman, Montana. 



Range: Washington to Wyoming and Assiniboia. 



Speclmens examined: Conconully, WJiiied 1312: Rattlesnake Mountains, Cotton 470; 

 Loomis, Elmer .565; Pullman, Piper 1.528; Elmer 820. 



Zonal distribution: Arid transition. 



This species is very closely allied to the eastern D. arguia, to which it has often been 

 referred. 



4. Drymocallis valida (Gieene). 

 Poteniilla valida Greene, Pittonia 3: 20. 1896. 



