1004 MISC. PUBLICATION 42 3, U. S. DEPT. OF AGRICULTURE 

 112. PEUCEPHYLLUM. Pigmy-cedar 



Much-branched shrub, whitish-barked, resinous-viscid, essentially 

 glabrous, denudate below, very leafy above; leaves alternate, linear- 

 filiform, subterete, obtuse or apiculate, densely glandular-punctate, 

 8 to 20 mm. long; heads solitary at the tips of the branches, subsessile, 

 yellow, discoid; involucre 2-seriate, subequal, of linear-lanceolate 

 acuminate phyllaries; achenes silky -pilose ; pappus of numerous 

 graduated bristles, the inner ones sometimes narrowly linear, flattened, 

 and paleaceous. 



1. Peucephyllum schottii A. Gray in Torr., U. S. and Mex. Bound. 



Bot. 74. 1859. 



Northern Mohave County to central Yuma County, up to 5,000 



feet but commonly lower, dry rocky slopes, March to June. Southern 



Nevada, western Arizona, southern California, and Baja California. 



113. PSATHYROTES 



Low, spreading, divaricately branched, annual (or perennial ?), 

 scurfy-tomentose, very leafy herbs ; leaves alternate, ovate to deltoid- 

 ovate, toothed or entire, petioled; heads solitary in the forks, small, 

 discoid, nodding or erect, yellow or purplish; involucre 2- or 3-seriate, 

 somewhat graduated, the phyllaries lanceolate to oblong or obovate, 

 at least the outer ones herbaceous, at least above; achenes densely 

 silky-villous ; pappus of numerous graduated bristles, becoming 

 yellow-brown in age. 



Key to the species 



1. Leaves entire, scurf y-tomentulose and bearing conspicuous, long, many- 

 jointed hairs, especially on the margin and petiole; achenes subcylindric, 



hispidulous 1. P. pilifera. 



1. Leaves toothed or crenate, without conspicuous, long, many-jointed hairs; 

 achenes obconic, densely silky-pilose (2). 

 2. Outer phyllaries obovate, much broader than the inner ones; plant, lanate- 



tomentose as well as scurfy 2. P. ramosissima. 



2. Outer phyllaries lanceolate, lance-ovate, or spatulate, not broader than the 

 inner ones; plant scurfy-tomentose 3. P. annua. 



1. Psathyrotes pilifera A. Gray, Amer. Acad. Arts and Sci. Proc. 19: 50. 



1883. 

 Lees Ferry, Coconino County, 4,200 feet (E. W. Nelson 55), August 

 and September. Southern Utah and northern Arizona. 



2. Psathyrotes ramosissima (Torr.) A. Gray, Amer. Acad. Arts and 



Sci. Proc. 7: 363. 1868. 



Tetradymia ramosissima Torr. in Emory, Mil. Reconn. 145. 



1848. 



Mohave and Yuma Counties, 1,000 feet or lower, plains and mesas 

 in gravelly or sandy soil, flowering throughout the year. South- 

 western Utah to western Arizona, southeastern California, and 

 northern Baja California. 



3. Psathyrotes annua (Nutt.) A. Gray, PL Wright. 2: 100. 1853. 



Bulbostylis annua Nutt., Acad. Nat. Sci. Phila. Jour. ser. 2, 

 1: 179. 1848. 



Southern Utah to southeastern California, western Arizona (?), 

 northern Baja California, and Sonora. 



