194 BOTANY. 



3-5" long, i" wide, linear-subulate, mucronate, producing the next year from 

 their axils fascicled shorter obtuse cricoid leaves ; heads corymbose ; involu- 

 cres of 4 whitish-pubescent or glabrate scales about 4" long ; florets 4 ; ache- 

 nia villous, the hairs much shorter than the pappus. — Sierras of California, 

 (Beckwith ;) Carson City, (Anderson.) In the Pah-Ute range and Unionville 

 and Monitor Valleys, Nevada, and Carrington Island, Great Salt Lake, on 

 dry foot-hills ; 5-5,500 feet elevation ; June, July. This species is best dis- 

 tinguished by the very weak erect primary leaves, and the glabrate fascicled 

 secondary ones. (683.) 



Teteadymia Nuttallii, T. & Gr. White-tomentose ; primary leaves 

 spreading, rigid and spiny, 6" long, bearing in their axils the next season fasci- 

 cles of spatulate obtuse shorter and broader canescent-tomentose secondary 

 ones ; heads corymbose ; involucral scales and flowers mostly 4, the former 

 about 4" long ; achenia villous. — Plains of the Snake River, Idaho, and on 

 Harris's Fork, Utah, (Nuttall!) Shore of Great Salt Lake, (Stansbury.) 

 Stansbury Island ; 4,500 feet elevation ; June. (684.) 



Teteadymia spinosa, H. & A. Branches, involucres and the recurved- 

 spreading rather stout spiny primary leaves densely white-tomentose ; second- 

 ary leaves fascicled, much snaaller than the spines, linear, obtuse, fleshy, 

 glabrous and cricoid ; heads solitary or racemose, rather large ; involucral 

 scales 5-6 ; florets 5-9 ; achenia densely silky-villous, the denticulate hairs 

 quite as long as the pappus. — Southern Idaho, (Tolmie, Nuttall ! Burke !) 

 Southern Cahfornia, near Fort Mohave, (Dr. Cooper !) Truckee and Trinity 

 Mountains, and Unionville Valley, Nevada; 4,500-5,000 feet elevation; May, 

 June. (685.) 



CiESiuM UNDULATUM, Spreng. Islands of Lake Huron to Oregon and 

 Cahfornia, and southward to Texas and New Mexico ; Carson City, (Ander- 

 son;) Stansbury Island, (Stansbury.) Throughout Nevada and Utah; the 

 commonest white-leaved thistle of the foot-hills and lower mountain-sides ; 

 5-8,500 feet elevation ; June-August. (686.) 



Var. ALBESCENS. Flowers pale yellowish-white.— Shore of Stansbury 

 Island; 4,300 feet elevation ; June. (687.) 



CiESiUM FOLiosuM, DC. (C. eduk, Nutt.) Stem erect, branched toward 

 the top, stout, striate, and somewhat woolly ; leaves loosely webby on both 

 surfaces, elongated, 6-11' long, not over 1' wide, irregularly sinuate-toothed, 

 the teeth triangular, and the veinlets ending in strong stramineous spines ; 



