188 BOTANY. 



Humboldt and Clover Mountains, Nevada, and in the Walisatch and XJintas ; 

 7-10,500 feet elevation ; June-September. (660.) 



Senecio lugens, Richardson. Perennial, vi^hite-tomentose, deciduously 

 lanate, or nearly smooth; stems 6-2° high, often several from one root; 

 leaves toothed or denticulate with gland-tipped teeth, sometimes entire, ob- 

 scurely veined, 2-5' long, 6-12" wide ; the radical obovate or spatulate, 

 obtuse, narrowed into a petiole ; the cauline sessile and partly clasping, grad- 

 ually becoming lanceolate and passing into subulate bracts ; corymb open or 

 dense ; heads rather large ; involucre with a few bractlets at the base, (calyc- 

 ulate,) the scales linear-lanceolate, acute, the tips usually blackish and seem- 

 ingly withering, (sphacelate ;) rays 10-12, twice as long as the involucre ; 

 achenia glabrous. — Occurring in one form or another from Arctic America to 

 Oregon and California, and eastward to the Saskatchewan and the mountains 

 of Colorado. Referred to the European and Asiatic S. campestris, DC, by 

 Dr. Hooker. The numerous specimens examined may be arranged in three 

 leading forms or varieties :— 



Var. Ho.okeei. {S. lugens, Hook. Fl. Bor. Am., 1. 332, t. 114) "De- 

 ciduously tomentose or naked, simple ; leaves entire, glandular toothed ; rad- 

 ical oblong-subspatulate, cauline lanceolate, acute, somewhat clasping; corymb 

 dense ; scales of the involucre conspicuously sphacelate." Hook, I. c. — Varies 

 with the leaves broader or narrower, and the corymb more lax and open. 

 Hall & Harbour's 316 and Bolander's 5063 represent this form. From the 

 vicinity of Salt Lake City to the Uintas near Bear River, frequent ; 4,500- 

 10,000 feet elevation; May-August. (661.) 



Var. Pareyi. Nearly glabrous, though at first slightly webby ; leaves 

 mostly not toothed, rather broad; involucral scales scarcely or not at all 

 blackened at the tips.— Parry's 21, Hall & Harbour's 326, Vasey's 332, are 

 examples of this form. Frequent from the base of the Sierras to the East 

 Humboldt Mountains ; 4,500-9,000 feet elevation ; May-August. (662.) 



Var. EXALTATUS. Stem and corymb densely webby-tomentose ; leaves 

 ample, more or less whitened, finely glandular-denticulate or entire ; heads 

 small, in a dense compound somewhat umbel-like corymb ; scales of the invo- 

 lucre with a dark mid-vein, and the ends somewhat blackened.— One of the 

 forms of 8. exaltatus, Nutt., fide Gray, PI Hall &f Harbour, p. 64. Colorado, 

 (Parry, 23 ! Hall & Harbour, 325! Vasey, 335!) New Mexico, (Fendler.) 



