( 483 ) 
Sierra Santa Monica, Brewer 71 (type); San Gabriel Canyon, 
Abrams 885; San Antonio Canyon, Baker 3466; Santiago Canyon, 
Santa Ana Mountains, Helen D. Geis 576; vicinity of San Bernar- 
dino, Parish 4202, 5130; foothills of the San Bernardino Moun- 
tains, S. B. & W.F. Parish 583; Riverside, Hall 1367; Mohave 
Desert, Brandegee; wash near Monrovia, Dudley, Nov. 13, 1907. 
17. PEUCEPHYLLUM. 
1. PeucepHyttum Scuotru A. Gray, Bot. Mex. Bound. 74. 
1859. 
Psathyrotes Schottit A. Gray, Proc. Am. Acad. 9: 206. 1874. 
Inyonia dysodioides M. E. Jones, Cont. W. Bot. no. 8: 42. 1898. 
Type locality: “Diluvial banks of the Colorado, in Sonora.” 
Distribution: Inyo County, southward through the desert 
region to Lower California and Sonora. Lower Sonoran, 
Specimens examined: Los Palmas, Hall 5840. 
18, TETRADYMIA. 
Heads 4-flowered; plants not spinescent. 
ves permanently canescent. ¥. T. canescens. 
Leaves glabrate. 2. T. glabrata 
Stems clothed ‘with slender ee leaves not spinescent-tipped. 
Achenes canescent but glabrate. 3: 7: stenolepis. 
Achenes with long, soft w be 4. T. spinosa. 
Stems without spines; leaves Ee teteattosee: achenes with long, soft 
wool. 5. T. comosa. 
1. TeTRapymia canescens DC. Prod. 5: 440. 1837. 
Type locality: “In Americae borealis ora occidentali ad Colum- 
bia River.” 
Distribution: Eastern Washington and Idaho, southward to 
the mountains of southern California. Arid Transition. 
Specimens examined: Mount San Antonio, S. B. W. F. Parish 
561; Bear Valley, Abrams 2913, 2135; Mount San Antonio, Abrams 
2693; Water Canyon, Tehachapi Mountains, dbrams McGregor 
469. 
2. TeTRaDyMIA GLABRATA A, Gray, Pacif. R. Rep. 2: 122, pl. 5. 
1854. 
Type locality: “On the Sierra Nevada.” 
