Rydberg: Rocky Mountain flora 125 



Erigeron salicinus sp. nov. 



Perennial with a slender rootstock ; stem simple, 4-7 dm. 

 high, glabrous or minutely and sparingly strigulose above ; lower 

 leaves petioled, about 1 dm. long ; , blades oblanceolate, dark 

 bluish-green, glabrous except the minutely ciliolate entire margins, 

 more or less distinctly 3-nerved ; upper leaves linear or linear- 

 lanceolate, sessile and half-clasping ; inflorescence corymbiform, 

 leafy ; heads y-S mm. high ; bracts linear-subulate, acuminate, 

 glandular-puberulent, not at all hirsute, in 2 series but almost 

 equal and crowded ; disk 12-15 mm - wide ; rays very numerous, 

 fuily 1 cm. long and less than 1 mm. wide, purple. 



This is perhaps nearest related to E. tnacranthus, differing in 

 the bluish-green narrow leaves, which are minutely ciliolate on 

 the margin instead of hirsute-ciliate, and in the smaller heads. 



Colorado : Pagosa Springs, 1899, Baker 670. 



Erigeron Vreelandii sp. nov. 



Perennial with a rootstock ; stem 6-7 dm. high, simple, 

 sparingly pubescent and puberulent ; lower leaves petioled, their 

 blades oblanceolate ; the rest sessile, lanceolate, somewhat clasp- 

 ing, entire, glandular-puberulent on both sides ; inflorescence 

 leafy, corymbiform ; heads fully 1 cm. high ; bracts linear-subulate, 

 hirsute and glandular-puberulent, in 2 series, almost equal ; disk 

 15-18 mm. wide; rays fully 1 cm. long, less than 1 mm. wide, 

 very numerous, dark-purple. 



This is nearest related to E. subtrincrvis, but the leaves are 

 glandular-puberulent instead of hirsute. It grows in meadows at 

 an altitude of about 2300 m. 



Colorado: Wahatoya Creek, 1900, Rydberg & Vreeland 5414. 



Erigeron Smithii sp. nov. 



Perennial with a rootstock ; stem simple, glabrous below, 

 glandular-puberulent above ; basal leaves 6-10 cm. long, petioled ; 

 blades oblanceolate or spatulate, glabrous, ciliate on the entire 

 margins ; upper stem-leaves lanceolate, sessile, more or less clasp- 

 ing and often reduced ; heads 1-5, on long almost erect branches, 

 about 6 mm. high ; bracts linear-subulate, acuminate, glandular- 

 puberulent, in two equal series ; rays purple, 10-12 mm. long, 1 

 mm. wide ; achenes strigose ; pappus double, the outer of very 

 short bristles. 



This is closely related to E. glabellas, but is more glabrous, 

 and has glandular-puberulent, not hirsute, bracts. It grows in 

 rich meadows at an altitude of 2 100-3000 m. 



