MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 443 



rays dark yellow, about 8 mm. long and 2-3 mm. wide ; achenes 

 oblong-cylindric, glabrous. 



In general habit most resembles S. microdontiis (Gray) Heller^ 

 but lacks the conspicuous rootstock of that species, and the bracts are 

 prominently black-tipped. It is distinguished from the other species 

 of the liigens group by the thick leaves and the callous denticulation. 

 Wet places in the mountains, at an altitude of 300—1000 m. 



Montana: Yogo Baldy, 1896, Flodinan, gij (type); Park Co., 

 1887, Tweedy, jjy, at least in part. 



Idaho: Lake Waha, 1896, A. A. & E. Gertrude Heller, 3252; 

 Lewiston, 3100. 



Senecio exaltatus Nutt. Trans. Am. Phil. Soc. (II.) 7 : 410 ; Senecio 

 liigcns exaltatus Gray, Bot. Cal. i : 413 [Syn. Fl. i^: 388 ; Man. 

 R. M. 209]. 



In wet meadows, up to an altitude of 2500 m. 

 Yellowstone Park : 1888, Dr. C/ias. H. Hall. 



* Senecio altus. 



Perennial, with a rather stout rootstock ; stems 6-iodm. high, striate, 

 sparingly woolly when ^^oung, leafy below ; basal leaves 2-3 dm. 

 long, rather firm, oblanceolate, tapering into a winged petiole, sinu- 

 ately dentate, more or less woolly on both sides when 3^oung ; lower 

 stem-leaves similar, smaller, short-petioled or subsessile, the upper 

 much reduced, bract-like, linear-lanceolate, distant; heads in a 

 contracted corymbiform cyme, about i cm. high ; bracts linear, rather 

 thick, brownish and tipped with black, much shorter than the disk; 

 rays about 8 mm. long, orange to lemon ; disk-flowers brownish 

 3'ellow ; achenes hispidulous, especially on the angles, less than half 

 as long as the white pappus. 



Nearest related to S. foliosus, but is easily distinguished by the 

 large basal and the small upper stem-leaves, the almost naked upper 

 portion of the stem, the small cyme, the dark involucre and disk, 

 and the tallness of the plant. From S. atratus, which it resembles 

 in the form and the size of the basal leaves, it differs in the sub- 

 naked upper portion of the stem, the smaller cyme, and the larger 

 more campanulate involucres. It grows in wet meadows, at an alti- 

 tude of about 2000 m. 



Montana: Spanish Basin, July i, 1897, Rydberg & Bessey^ 

 52^8 (type); 1896, Flodman, gio and gi2; Little Belt Mountains,. 

 1883, Scribner, i2j. 



Yellowstone Park : 1885, Tzveedy, yi^.. 



