RvDBERG : Studies on Rockv Mountain Flora 181 



Montana : Little Belt Mountains, 1896, Flodman, gi8 (type); 

 Madison Co., Mrs. McNulty ; Bear Gulch, 1887,/': Tweedy, 340; 

 Columbia Falls, Mrs. Kennedy, g ; Spanish Basin, 1897, Rydberg 

 &■ Bessey, 5263 ; Indian Creek, 3264. 



Wyoming : Lone Star Geyser Basin, Yellowstone Park, 1 897, 

 Rydberg & Bessey, 3262. 



Colorado: Grizzley Creek, 1896, C. F. Baker; Long's Peak, 

 1886, G. IV. Letterman ; Mancos, 1898, Baker, Earle & Tracy, 



45- 



New Mexico: Pecos River, 8 miles east of Glorietta, 1897, 



A.A.&E. Gertrude Heller, 3682. 



Utah: E. Humbolt Mts., 1868, S. Watson, 667. 



17. Senecio platylobus sp. nov. 

 S. aureus var. croceus D. C. Eaton, King's Exp. 5 : 190, in part. 



1871 ; not Gray. 1863. 



A stout, perfectly glabrous perennial : stem about 4 dm. high, 

 rather leafy, striate and somewhat angled : basal leaves 6-10 cm. . 

 long, slender-petioled, obovate or broadly oval, sinuately crenate- 

 dentate, thin : lower stem leaves oblanceolate, petioled, deeply 

 lobed or divided with rounded lobes : upper stem leaves broadly 

 ovate in outline, sessile, pinnately divided into broadly oblong or 

 cuneate divisions which are more or less deeply sinuate-dentate : 

 cyme compound ; its branches corymbiform : heads about 8 mm. 

 high ; bracts broadly lanceolate, acute, membranous margined and 

 slightly shorter than the disk : rays 6--/ mm. long, and 3 mm. 

 wide, 5 -nerved : achenes striate, glabrous. 



Probably nearest related to the preceding, but easily distin- 

 guished by the form of the leaves and the broad rays. It grows 

 at an altitude of about 1500 m. [Plate 6, f 8.] 



Utah : Wasatch Mountains, 1869, S. Watson, 671 (type in the 

 Torrey Herbarium). 



18. Senecio flavovirens sp. nov. 

 ^. Balsamitae Rydberg, Mem. N. Y. Bot. Card., i : 446, mainly ; 



1900 ; not Muhl. 1804. 



Light or yellowish green, slender, perennial, in age glabrate or 

 slightly floccose at the base of the leaves : stem 3-4 dm. high, 

 striate, pale : basal leaves 3-8 cm. long, obovate or broadly oval, 

 generally tapering into the petioles, but sometimes truncate at the 

 bases, obtuse, crenate or sinuate, light green : lower stem leaves ob- 



