158 Rydberg : Rocky Mountain flora 



tracted into short petioles, sparingly arachnoid when young, glab- 

 rous and rather thick in age ; stem-leaves lanceolate, sinuately 

 toothed, auricled and clasping at the base, arachnoid when young ; 

 inflorescence small, with 3-6 heads, which are about r cm. high ; 

 bracts linear, 7-8 mm. long, abruptly acute at the apex, with a 

 triangular black tip; rays light-yellow, broad; achenes striate, 

 glabrous. 



Related to 5. exaltatus and 5. integerrimus, but differing from 

 the former in the entire basal leaves and small corymb, from the 

 latter in the abruptly acute black-tipped bracts, and from both in 

 the lower stature and the broader basal leaves. 



Southwestern Colorado : W. F. Flint. 



J 



Senecio Harbourii Rydb. sp. nov. 



Perennial with a branched caudex ; stem 1-2 dm. high, striate, 

 white-floccose, leafy; basal leaves and most stem-leaves petioled, 

 3—10 cm. long, densely white-floccose; blades oblanceolate or 

 linear-spatulate, entire ; uppermost stem-leaves sessile, lanceolate, 

 1-3 cm. long, more or less auricled at the base ; inflorescence 

 corymbiform, with 2-7 heads, which are mostly 10-15 mm. high ; 

 bracts narrowly linear, long-attenuate, light yellowish-green and 

 slightly floccose ; the calyculate ones minute, subulate ; rays 

 bright-yellovv, over 1 cm. long and 2 mm. wide ; achenes brown, 

 shining, glabrous, angled. 



This species is most nearly related to *S. Pitrshianus and S- 

 canus. From the former it differs in the large heads, longer rays 

 and more leafy stem, and from the latter in the lower habit, nar- 

 rower and always entire leaves, and the turbinate-campanulate in- 

 stead of hemispheric heads. It grows in the mountains of Colo- 

 rado at an altitude of 2700-4000 m., and was first collected by 



f/,. f Hall & Harbour. 



Colorado : 3 



j 



1 90 1, G. E. OsterJiout 2424 (type); mountains between Sunshine, 

 and Ward, 1902, F. Tzveedy 4.861 ; Silver Plume, Aug. 24, 1895, 

 C. L. Shear 4599 ; also at the same date and locality, P. A. 



Rydberg. 



4 Senecio oodes Rydb. sp. nov. 



Perennial, with a stout rootstock and caudex; stem 3-4 dm. 

 high, slightly floccose below, branched ; basal leaves long-petioled, 

 loosely villous-floccose when young, in age glabrous ; petioles 



