194 
BOTANY. 
3-5" long, wide, linear-subulate, mucronate, producing the next year from 
tbeir axils fascicled shorter obtuse cricoid leaves ; beads corymbose ; involu- 
cres of 4 wliitisb-pubescent or glabrate scales about 4" long ; florets 4 ; acbe- 
nia villous, the bairs mucb sborter than tbe pappus. — Sierras of California, 
(Beckwitb ;) Carson City, (Anderson.) In the Pab-Ute range and U nionville 
and Monitor Valleys, Nevada, and Carrington Island, Great Salt Lake, on 
dry foot-bills ; 5-5,500 feet elevation; June, July. Tbis species is best dis- 
tinguished by tbe very weak erect primary leaves, and tbe glabrate fascicled 
secondary ones. (683.) 
Tp:tradymia Nuttallii, T. & G. Wbite-tomentose ; primary leaves 
spreading, rigid and spiny, 6" long, bearing in tbeir axils tbe next season fasci- 
cles ofspatulate obtuse sborter and broader canescent-tomentose secondary 
ones ; heads corymbose ; involucral scales and flowers mostly 4, tbe former 
about 4" long ; acbenia 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. (G84.) 
Teteadymia spinosa, II. & A. Branches, involucres and tbe recurved- 
spreading rather stout spiny primary leaves densely wbite-tomentose ; second- 
ary leaves tasciclcd, much smaller than tbe spines, linear, obtuse, fleshy, 
ghil)rous and cricoid; beads solitary or racemose, rather large; involucral 
scal(;s 5-6 ; florets 5-9 ; acbenia densely silky-villous, the denticulate bairs 
(piite as loiio- as tbe pappus. — Southern Idaho, (Tolniie, Nuttall ! Burke !) 
Southern Calitoriiia, near Fort Mohave, (Dr. Cooper !) Truckee and Trinity 
Mountains, and Unionvillc Valley, Nevada; 4,500-5,000 feet elevation; May, 
June. (685.) 
CiRSiUM UNDULATUM, Spreug. Islands of Lake Huron to Oregon and 
California, and southward to Texas and New Mexico; Carson City, (Ander- 
son ;) Stansl)ury 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.) 
CiKSiUM FOLiosuM, DC. (C. edtik, Nutt.) Stem erect, branched toward 
tbe top, stout, striate, and somewhat woolly ; leaves loosely wcbby on both 
surfaces, elongated, 6-11' long, not over 1' wide, irregularly sinuate-toothed, 
the teeth tnangular, and the veinlets ending in strong stramineous spines j 
