Rydbekg : RocKV Mountain flora 159 



4-9 cm. long; blades thick, oval, 3—6 cm. long, 1.5—4 cm. wide, 

 rounded or obtuse at the apex, abruptly contracted below, coarsely 

 dentate-crenate with triangular-ovate, obtuse teeth ; lower stem- 

 leaves similar, the petioles with enlarged toothed or lobed stipule- 

 like bases ; the upper short-petioled and narrower ; inflorescence 

 corymbiform ; heads many, about I cm. high; bracts linear, 

 abruptly acute, 5-7 mm. long, slightly villous ; rays bright-yellow, 

 l'^— 12 mm. long, about 2 mm. wide; achenes glabrous, round- 

 angled. 



This is perhaps most closely related to 6". cyinbalarioidcs, but 

 differs in the stouter, more branched and more leafy stem and the 

 large ample stem-leaves. It grows in the higher mountains of 

 Colorado. 



Colorado : Mt. Harvard, 1896, F. E. Clciiioits jp (type); 

 Robinson, Aug. 23, 1896, C. L. S/un/- jjjj. 



Senecio Tracyi Rydb. 



Perennial with a short rootstock ; stem about 4 dm. high, 

 glabrous ; basal leaves glabrous, long-petioled ; petioles 3— 10 cm. 

 long, slender ; blades round-oval or oval, thin, 1.5-5 cm. long, 

 1—3 cm. wide, entire or merely wavy, rounded at the apex, rounded, 

 truncate or subcordate at the base ; stem- leaves lanceolate, acu- 

 minate, 2—6 cm. long or the uppermost still smaller, sinuate-cre- 

 nate, the lower cuneate at the base, the upper auriculate- clasping; 

 inflorescence a small compact c)'me ; heads 8-1 1, broadly turbi- 

 nate, 6-y mm. high ; bracts linear, abruptly acute, glabrous, the 

 calyculate ones subulate, sparingly arachnoid ; rays yellow, 6-8 

 mm. long, about 2 mm. wide. 



The species belongs to the S. aureus group and is somewhat 

 intermediate between ^. crocatus, S. pyrochroits and 6". fcdifoluis. 

 From the two first it differs in the paler rays and the form of the 

 stem-leaves and from the last in the much larger size and the pres- 

 ence of rays. It grows at an altitude of 3150 m. 



Colorado: Bob Creek, west of Mt. Hesperus, July i, 1898, 

 Baker, Earle & Tracy 2 yd. 



Senecio turbinatus R}-db. sp. no v. 



Perennial with a cespitose rootstock ; stem scapiform, about 

 1.5 dm. high, more or less floccose ; basal leaf-blades cuneate- 

 obovate, thick, 2-3 cm. long, 8-18 mm. wide, loosely floccose 

 when young, dentate above the middle, rounded at the apex. 



