188 Rydberg : Studies on Rocky Mountain Flora 



Senecio mutabilis Greene, Pittonia, 4: 113. 1900 



■ 



As I have seen no specimens of this species I have not been 

 able to include it in my key. It may be the same as the preced- 

 ing, but several characters given in the description do not agree 

 with it, especially the deeply tridentate rays. Professor Greene is 



- 



always criticizing other botanists for drawing vague descriptions. 



No better example of just such a description can be given than the 



one here made by himself. 



'i 



30. .Senecio rosulatus sp. nov. - * fi~*'t**n h **j 



Senecio aureus var. Balsamitcic A. Gray, Proc. Acad. Nat. Sci. 

 Phila. 1863 : 68, in part. 



More or less tomentose perennial, with a branched rootstock 

 and generally numerous underground stolons producing leafy off- 

 sets : stems 2-3 dm. high, floccose or sometimes becoming almost 

 glabrate in age ; first leaves of the offsets spatulate and entire ; 

 other basal leaves and lower stem leaves oblanceolate, finely white 

 tomentose especially on the lower surface, occasionally becoming 

 more glabrate in age, sinuately pinnatifid with rounded lobes, 

 petioled : upper stem leaves lanceolate or linear, sessile, auricled at 

 the base also with rounded lobes : cyme corymbiform, open : 

 heads smaJl, 5-6 mm. high, floccose at the base : bracts about 12, 

 broadly lanceolate, acute, yellowish with rather broad membranous 

 margins, much shorter than the disk : rays about 5 mm. long and 

 2 mm. wide, 4-5 -nerved : achenes strongly striate, glabrous. 



The species has been confused with 5. Fendleri, but is distin- 

 guished by the more slender rootstock and the numerous branches 



* 



forming offsets, the entire first leaves not seen in that species and 

 the short rounded entire lobes of the stem leaves. The heads are 

 usually also smaller. It grows at an altitude of 2500-4000 m. 

 [Plate 6, f. 4, 4a.] 



Colorado: Georgetown, 1885, N. H. Patterson yp (type); 

 Golden City, 1892, E. L. Greene ; 1862, Hall & Harbour, jjj, 

 in part; 1871, IV. M. Can by ; Twin Lakes, 1873,/. M. Coulter; 

 Pike's Peak, 1884, G. W. Letter man, 260; Caribou, 1891, > E. 

 Penanl, 228 ; Fort Collins, 1896, C. F. Baker; Silver Plume, 

 Gray's Peak, and Georgetown, 1895, P. A. Rydberg. 



Mem. Am 



1849 



The typical S. Fendleri is a rather rare plant with a decidedly 

 woody rootstock and caudex. None of the specimens seen show 



