224 University of California Publications in Botany. [VOL. 3 



paleaceous toothed bristles. The style-branches, moreover, are 

 more like those of Luina, than of. any genus in the Helenieae. 

 while in corolla and some other characters it resembles Psathy- 

 rotes. Since its affinities are so doubtful I here follow Bentham 59 

 in placing Peucephyllum in the Senecioneae, at least provisional- 



ly. 



1. P. Schottii Gray, Bot. Mex. Bound. 74 (1859) ; Jones, Zoe 

 v. 41 (1900). Psathyrotes Schottii Gray, Proc. Am. Acad. ix. 

 206 (1874). Inyonia dysodioides M. E. Jones, Contr. W. Bot. 

 viii. 42 (1898). 



Sometimes only 3 dm. or so high and spreading, more often 1 

 to 3 m. high and with a trunk-like stem: bark rough: leaves 

 green, crowded on the ultimate branchlets, 5 to 20 or even 30 cm. 

 long, punctate and exuding a balsamic resin: heads scattered, 

 nearly sessile and hidden by the upper leaves: involucre nearly 

 1 cm. high ; bracts green, linear-subulate. 



In canons and on foothills of the Lower Sonoran Zone from 

 Inyo Co. to Lower California and Arizona: Panamint canon. 

 Inyo Co., M. E. Jones; Ord Mts. ; Warrens; Whitewater; Mo- 

 rongo Pass; Thousand Palms; hills near Coachella; Indio Mts.; 

 Palm Springs ; Canon Springs Wash ; Split Mt. ; Calamujuet, 

 on the coast of Lower California, May 11, 1889, Bran-degee. 



93. PSATHYROTES Gray. 



Low winter annuals (and biennials?) of the Desert Area. 

 Herbage scurfy or tomentose. Leaves alternate, petioled, broad 

 and rounded. Heads discoid. Involucre broadly hemispheric. 

 Receptacle flat, naked. Corolla with very short proper tube, 

 elongated cylindric throat, and short teeth which are more or less 

 woolly or glandular. Style-branches flattish, obtuse. Achenes 

 turbinate, villous. Pappus of numerous short scabrous bristles. 

 varying from white to ferruginous in the same species. 



Outer involucral bracts much broader than the inner, the obtuse tips spread- 

 ing or recurved: leaves thick 1. P. ramosissima. 



Outer involucral bracts not very different from the inner, all with erect 

 tips: leaves thinner 2. P. annua. 



59 Bentham, in Bentham and Hooker, Gen. PI. ii. 438 (1873). 



