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 I 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 S. cxaltatiis and 5. i}itcgcrriiiiits, 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. 



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-yellow, over i cm. long and 2 mm. wide ; achenes brown, 

 shining, glabrous, angled. 



This species is most nearly related to 6". Furshiamis and S- 

 caiiiis. 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 

 Hall & Harbour. 



Colorado : Mountains south of Ward, Boulder Co., July 18, 

 1 901, G. F. OsterJunit 2^2^ (type); mountains between Sunshine, 

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

 C. L. Shear 45gg ; also at the same date and locality, P. A. 

 Rydberg. 



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 



