A. TRUNCATA. 277 



to dark amber, shining; radicle superior. (Obione truncata Torrey, in Watson, Bot. 

 King's Expl. 291, 1871.) 



Great Basin of western North America and adjacent territory; Montana to eastern 

 Colorado, northwestern New Mexico (according to Standley), eastern California, eastern 

 Washington, and British Columbia; apparently most plentiful in Idaho. Type locality, 

 near Carson City and on the Truckee River, Nevada. Collections: Armstead, southwest- 

 ern Montana, Hall 11502, 11562 (UC); Bitter Creek, Green River, Wyoming, Nelson 

 8I4I (Gr); near Fountain, Geyser County, Wyoming, Mearns 3170 (US); Laramie, 

 Wyoming, Johnston 2333 (UC); 3 km. east of Longmont, Colorado, not common. Hall 

 11074 (UC); Argo, Denver, Colorado, Eastwood 70 (UC, US, minor variation 1, var. 

 stricta Gray); Fish Lake, Utah, Jones 5745 (Herb. Jones, NY, UC, US, type collection of 

 A. suhdecumhens Jones, minor variation 2); Salt Lake City, Utah, Jones 1306 (DS, Gr, 

 US); Nevada: San Antonio Desert, Purpus 64I8 (UC, US, minor variation 1, variety 

 stricta Gray, in part) ; Smoke Creek, Griffiths and Hunter 509 (US) ; type collections, 

 near Carson City, Anderson 40 (Gr, NY) and northwestern Nevada, Bailey 987 (Gr); 

 Sparks, ^a« 11025 (UC); Palisade, August, 1885, Brandegee (UC); Wells, Humboldt 

 River YaMey, Hall 11035 (UC); California: Randsburg, 1913, Brandegee (UC); Monache 

 Meadows, southern Sierra Nevada, Purpus 3007 (UC, minor variation 2, A. suhdecum- 

 hens Jones); Benton Hot Springs, Mono County, Hall 11699 (UC); Bridgeport, Mono 

 County, Hall 11693 (UC) ; Loyalton, Sierra County, Eastwood 7859 (SF) ; eastern Oregon, 

 E. Hall 433 (Gr, type of variety stricta Gray, minor variation 1); Klamath Agency, Ore- 

 gon, Walpole 2310 (NY, US) ; Alma, Okanogan County, Washington, Elmer 531 (NY, 

 US); Idaho: Weiser, September 20, 1919, Hall (UC); Twin and Shoshone Falls, Nelson 

 and Macbride 1373 (DS, Gr, NY, UC, US, minor variation 1, variety stricta Gray); New 

 Plymouth, Canon County, Machride 323, 715 (DS, UC); Pocatello, Palmer 412 (Gr, 

 NY, UC, US); Leadore, Hall 11507 (UC); near Egbert Spring, Douglas County, Wash- 

 ington, Sandherg and Leiherg 372 (SF, UC); Donald, British Columbia, August 10, 1890, 

 Macoun (Gr). Additional localities, mostly represented by specimens in the Rocky 

 Mountain Herbarium, are Rawlins, Poison Spider Creek, Point of Rocks, Huttons Lake, 

 Sheridan, Howell Lakes, Green River, Laramie River, and Granger in Wyoming; 

 Windsor, Fort Collins, Boulder County, and Delta in Colorado; Marysvale and Gunnison 

 in Utah; Wadsworth in Nevada; and Silver Lake, lone, and Morrow County in Oregon. 



MINOR VARIATIONS AND SYNONYMS. 



1. Atriplex truncata var. stricta Gray, Proc. Am. Acad. 8: 398, 1872. — Described from eastern Oregon 

 plants as follows: foliis hastato-lanceolatis nunquam cordatis, inferioribus basi cuneatis; inflorescentia virgata 

 minus foliata. This is an occasional development that appears at widely separated stations (e. g., Denver, 

 Colorado, Eastwood 70, UC). Therefore it is doubtless an ecad. Perfectly simple-stemmed and rigidly erect 

 plants are sometimes found, but along with them grow others with a few erect branches from the base. Along 

 Green River, in Utah, the strict form grows on bottom-lands where partly shaded. 



2. A. SUBDECUMBENS, Jones Proc. Calif. Acad. II, 5:716, 1895. — Plants low, branched from the base and 

 the short branches subdecumbent ; leaves only 0.5 to 1.5 cm. long, mostly rounded or narrowed to the base. 

 Type locality. Fish Lake, Utah, 2,750 m. altitude in gravelly meadows (Jones 571^5). The extreme of this 

 form is strikingly different from the rigidly erect plants characteristic of true Iruncala, but the difference is 

 scarcely greater than between the extremes of .4. cordulata or even of A. argentea (compare the minor variation 

 of the latter listed as variety hillmani). The small narrow leaves are remarkable, but even in the type collec- 

 tion some are ovate from a broad base which is abruptly narrowed to a petiole. Still broader leaves are found 

 on plants in which the habit is decidedly decumbent (Monache Meadows, California, Purpus 3007, UC). In- 

 termediate, both in habit and foliage are: Randsburg, California, 1913, Brandegee (UC); Palisade, Nevada, 

 August, 1885, Brandegee (UC). Prostrate and erect plants, both with subhastate leaves, sometimes grow 

 together (Leadore, Idaho, Hall 11507, UC). Decumbent plants are produced by injury to the main stem, as by 

 grazing (Bridgeport, California, Hall 11693, UC). 



3. Obione truncata Torrey, in Watson, Bot. King's Expl. 291, 1871.-^4. truncata.' 



