166 University of California Publications in Botany [Vol. 9 



Lake Lucile and Lake of the Woods, Tahoe, Dudley, June 26, 1900; 

 west side of Slide Mountain, Washoe County, Nevada, 8,600 feet. 

 Heller 10959 ; head of Galena Creek, Washoe County, 8,500 feet. Heller 

 9899; Mt. Rose, 9,500 feet, Heller 10220; high peaks above Webber 

 Lake, Lenunon 1202; top of Kettle Mountain Ridge, Fresno County, 

 Dudley, August 23, 1904; Long Meadow, Tulare County, Dr. E. 

 Palmer in 1882 (co-type of E. polypodum). 



This species is yevj near the preceding and differs mainly in the 

 looser habit of the caudex; it is very possible that a monographic 

 study of all the species of Eriogonum will result in many changes in 

 the position of the earlier described species, which, with the increase 

 in the number of specimens available for comparison, will appear less 

 easily separable than their extreme forms, the bases for a number of 

 the now accepted species. 



2. OXYRIA 

 1. Oxyria digyna (L.) Hill, Hort. Kew., p. 158. 1768. 



Bumex digynus L., Sp. PI., p. 337. 1753. 



Type locality. — "Habitat in Alpibus Lapponicis, Helveticis, Wall- 

 icis, ' ' 



Range. — Holarctic realm; in America south to New England, New 

 Mexico, and southern California. 



Zone. — Arctic-alpine; rarely in the Hudsonian. 



Specimens examined. — Sierra County, Lemmon 720; Hope Valley, 

 Alpine County, 8,000 feet, Hansen 309; Castle Peak, Lemmon; Dick's 

 Peak, Tahoe, 9,700 feet. Smiley 427; summit of Devil's Cliff, Summit, 

 Kennedy and Doten 286; cliffs at Glen Alpine, Tahoe, 7,000 feet (?), 

 McGregor 167 ; Castle Peak near the highest point. Heller 7097 ; high 

 mountain near Donner Pass, Torrey 430 ; Mono Pass, 9,000 feet, R. A. 

 Ware 2614c; Mt. Goddard, 9,700 feet. Hall and Chandler 656; Mt. 

 Dana, H. M. Evans, July, 1901 ; same locality, 9-10,000 feet. Brewer 

 1795; above Elizabeth Lake, Yosemite, 10,000 feet, Smiley 807; 

 Kaweah Peaks, Dudley 2443; Mt. Whitney, 13,000 feet, Culbertson 

 (B4528). 



This species is perhaps the most characteristic plant of the Arctic- 

 alpine zone and is very rarely found below tree-line. 



