( 484 ) 
Distribution: Mohave Desert, northward through the arid 
regions to eastern Oregon. Upper and Lower Sonoran. 
Specimens examined: Mohave Desert, Pringle, May 24, 1882; 
Rabbit Springs, S. B. & W. F. Parish 1259; Lancaster, Elmer 
3676; Dudley 4313. 
3. TETRADYMIA STENOLEPIS Greene, Bull. Calif. Acad. 1: 92. 
1885. 
Type locality: “Mountains of Kern Co., California.” Accord- 
ing to Hall (Univ. Calif. Pub. Bot. 3: 227) “the type specimens 
were gathered a short distance southwest of the Southern Pacific 
railroad between Cameron and Mohave stations.” 
Distribution: Mohave Desert, from Antelope Valley eastward 
to Inyo County. Lower Sonoran. 
Specimens examined: Cushenberry Springs, Abrams 2140; 
Antelope Valley, Oliver; hills near Kernville, Purpus 5651; Teha- 
chapi, Mrs. Curran, 1884; Mohave Desert, Davidson, Aug. 1, 
1901; between Tehachapi and Mohave, Abrams tF McGregor 400. 
4. TETRADYMIA sPInosA Hook. & Arn. Bot. Beech. 360. 1840. 
Type locality: “Snake Country.” First collected by Tolmie. 
Distribution: Eastern Oregon and Idaho, southward through 
the Great Basin to the Mohave Desert. Lower Sonoran. 
Specimens examined: Mohave Desert, Pringle, May 14, 1882; 
Lancaster, Elmer 3670. 
5. TETRADYM1A comosa A. Gray, Proc. Am. Acad. 12: 60. 1876. 
Type locality: “W. Nevada, Lemmon, S. E. borders of Cali- 
fornia, E. Palmer, Potrero, San Diego Co. D. Cleveland.” 
Distribution: Southern Nevada, to the southern boundary of 
California. In southern California this species is most frequent 
on the dry interior hills and plains of the coastal slope, but it 
also occurs, according to Parish, on the Mohave Desert in the 
vicinity of Lancaster and Hesperia. 
Specimens examined: Potrero, Cleveland, 1876; Susan G. Stokes, 
July 14, 1895; vicinity of San Bernardino, Parish, July, 1899; 
Cucamonga, Abrams 2942; Etiwanda, Abrams 1912; near San 
Jacinto, Hasse, July 4, 1892; Campo, Palmer 95. 
