104 University of California Puhlications in Botany [Vol. 9 



4. Poa Pringiei Scribn., Bull. Torr. Bot. Club, vol. 10, p. 31. 1883. 

 Type locality. — "Moiuitaiiis about the headwaters of the Sacra- 

 mento River, California." Fringle. 



Range. — Mt. Shasta region through the high Sierra to the 

 Tehachapi Mountains. 



Zone. — Canadian rising into the Hudsonian, 



Specimens examined. — Above Siunmit Valley, 9,500 feet, Pringle, 

 September 27, 1882 ; ridge south of Donner Pa.ss, 8,500 feet, Heller 

 7,157 ; Suzy-Heather Lake trail, Tahoe, 8,000 feet. Smiley 164 ; Tuol- 

 umne meadows, Congdon, August 18, 1890 ; Mt. Whitney, Coville and 

 Funston 2066. 



4a. Poa Pringiei var. Hansen! (Scribn.), comb. nov. 



P. Hanseni Scribn., U. S. Dept. Agr., Div. Agrost, Bull. 11, p. 53. 1898. 



Type locality. — "Silver Lake, Amador County, Cal. " 



Range. — Same as the species but at somewhat higher elevations. 



Zone.- — Arctic-alpine mainly. 



Specimens examined. — Mt. Rose, summit, Kennedy 1165 ; same 

 locality at 10,300 feet. Heller 10,651. 



This variety differs from P. Pringiei only in the dwarf size and 

 filliform leaves. 



5. Poa Pattersoni Vasey and Scribn., Contr. Nat. Herb., vol. 1, 



p. 275. 1893. 



Type locality. — "Mountains of Colorado, near Grays Peak, 11,000 

 to 14,000 ft. altitude." 



Range. — Central Rocky Mountains of Colorado and Wyoming: 

 west to California? 



Zone. — Alpine in the Rockies (ace. Nelson in Coulter-Nelson, Man., 

 p. 71). 



Specimens examined. — Pyramid Peak, 9,500 feet. Smiley 344; 

 Desolation Valley, 8,000 feet, Smiley 95; Tamarack trail, Tahoe, 

 meadow at 8,000 feet. Smiley 262. 



These specimens, all from the east slope of the Sierra (where sev- 

 eral boreal Rocky Mountain species rarely occur), are referred here 

 rather than to P. Pringiei, where closely similar forms have been 

 placed, because of the well developed pilosity upon the keel and lateral 

 nerves of the lemma, which in typical P. Pringiei, and its variety, is 

 merely scabrid. Beal (N. Am. Grasses, vol. 2, p. 578) considered these 

 species identical. 



