158 RYDBERG: Rocky MounrAIN 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 1 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. exaltatus and S. 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 CoLorapo: W. &. 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 oF 
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 1 cm. long and 2 mm, wide; achenes brown, 
shining, glabrous, angled. 
This species is most nearly related to S. Purshianus 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, nat- 
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. 
~ Cotorapo : Mountains south of Ward, Boulder Co., July 18; 
1901, G. &. Osterhout 2424 (type); mountains between Sunshine, | 
and Ward, 1902, F. Tweedy 4861; Silver Plume, Aug. 24, 1895: 
C. L. Shear 4599; also at the same date and locality, P. 4. 
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 
