A. CONFERTIFOLIA. 339 



Dry alkaline plains and slopes; Montana, North Dakota, Wyoming, and Colorado to 

 Chihuahua (according to Torrey, Bot. Mex. Bound. 183, 1859), northern Arizona, 

 eastern CaUfornia (except on the Colorado Desert), eastern Oregon, and southern 

 Idaho. The most abundant species on stony plains and hillsides in the Great Basin. 

 Type locality, borders of Great Salt Lake. Collections: Colgate, eastern Montana, 

 Sandberg 894? (UC) ; Medora, North Dakota, Lee 606 (NY) ; Powder River, Wyoming, 

 Nelson 9Jf20 (Gr) ; Carter, Wyoming, Nelson 4619 (UC) ; near Pueblo, Colorado, Greene 

 (Gr, UC) ; Grand Junction, Colorado, May, 1892, Eastwood (UC) ; Naturita, southwest- 

 ern Colorado, Payson 2S25 (SF, UC); Holbrook, Arizona, 1883, Rushy (NY, UC); 

 Navajo Reservation, Arizona, Standley 74-81 (US, type of A. collina Wooton and Stand- 

 ley, minor variation 1); Granite Wells, San Bernardino County, California, Parish 10186 

 (DS, UC); south of Lone Pine, Owens Valley, California, Hall and Chandler 7315 (UC); 

 Honey Lake Valley, California, Davy 3274 (UC); Las Vegas, Nevada, Goodding 2314 

 (Gr, NY, UC); Palisade, Nevada, August 1885, Brandegee (UC); St. George, Utah, 

 Goodding 795 (DS, UC); type collection, Utah, Fremont (NY); near Christmas Lake, 

 eastern Oregon, Leiberg 775 (Gr, NY) ; Twin Falls and Shoshone Falls, Idaho, Nelson 

 and Macbride 1379 (Gr, NY, UC, type collection of A. subconferta Rydberg, minor 

 variation 4); south of Albion, southern Idaho, September 17, 1819, Hall (UC). Addi- 

 tional localities within the area represented by the above citations may be obtained in 

 abundance from herbaria. Merriam (N. Am. Fauna 7:323, 1893) gives details of dis- 

 tribution in southern Nevada and California. Western McKinley and San Juan Coun- 

 ties, New Mexico, are stations mentioned by Wooton and Standley (Contr. U. S. Nat. 

 Herb. 19:205, 1915). 



MINOR VARIATIONS AND SYNONYMS. 



1. Atriplex coluna Wooton and Standley, Contr. U. S. Nat. Herb. 16: 119, 1913.— Distinguished from 

 typical confertifolia by the elliptic-obovate or rarely suborbicular small leaves and especially by the fruiting 

 bracts, which are dentate at least near the bases of the wings. Plants are sometimes found with the leaves of 

 the shape and size characteristic of collina, but with bracts as in typical confertifolia (Mineral County, Nevada, 

 Brandegee, UC; near Albion, Idaho, Hall, UC). The only specimens seen with regularly dentate bracts 

 are the types of collina. In a specimen from Thompson's Spring, southeastern Utah (Rydberg and Garrett 8331, 

 NY) the leaves are as in typical confertifolia, while the bracts vary from entire through undulate to obtusely 

 2-toothed on each margin. This indicates so much variation in the characters used for the separation of 

 collina that its acceptance as a distinct species may be deferred at least until better known. The type locality 

 is the north end of the Carrizo Mountains, Arizona, but the distribution is extended in the North American 

 Flora to include southwestern Colorado, southeastern Utah, and northeastern Arizona. 



2. A. CONFERTIFOLIA X CANEscENs. — An Undoubted hybrid between these species was found at Winslow, 

 .\rizona {Loft field and Hall 11176, UC). The habit is that of confertifolia; the leaves are intermediate, being 

 elliptic-oblong and elliptic-spatulate, 1 to 2 cm. long, 0.4 to 1 cm. wide; the fruiting bracts vary all the way 

 from those of confertifolia to equally 4-winged, as in canescens, many of them with a pair of flat terminal wings 

 and one or two divergent basal lobes. Some of the seeds are shriveled and infertile, others appear to be normal, 

 and these probably are viable. Both of the supposed parents grew on the hillside where the specimen was 

 collected. 



3. A. SPINOSA Dietrich, Syn. PI. 5: 536, 1852. — Based upon Obione spinosa, which see. 



4. A. SUBCONFERTA Rydberg, Fl. Rocky Mts. 248, 1917.— Separated from A. confertifolia on the basis of 

 its oblanceolate, acute or acutish leaves and its lance-oblong usually acute bracts. The type specimen, which 

 came from "Twin Falls and Shoshone Falls," Idaho (Nelson and Macbride 1379) appears to be abnormally 

 developed. In one of the duplicates of the type at the University of California some of the bracts have a very 

 small body and narrow, lanceolate wings, while other bracts on the same stem have well-formed bodies and 

 ovate, obtuse wings. Bracts of the latter type are 8 mm. long by 6 mm. broad. The foliage is not exactly 

 like that of any specimen seen of genuine confertifolia, the leaves being exceptionally narrow in proportion to 

 their length. 



5. Obione confertifolia Torrey and Fremont, in Fremont, Rep. Calif. 318, 1845.— The original name of 

 Atriplex confertifolia. 



6. O. SPINOSA Moquin, in DeCandolle, Prodr. 13': 108, 1849.— Universally regarded as a synonym of the 

 earlier 0. confertifolia, which, from the description, it appears to be. Based upon plants gathered somewhere 

 on the drainage basin of the Columbia River by Nuttall. 



