<;.~>4 Rydberg : Rocky Mountain flora 



linear, the outer obtuse, the inner acute, green or the inner white 

 on the sides below, pubescent on the back, but not bristle-pointed ; 

 rays purple, about 8 mm. long and I mm. wide ; achenes pubescent. 



This is nearest related to A. griseus Greene, but differs in the 

 small size, the narrow short sessile leaves, and the pubescence 

 which is not reflexed on the lower part of the stem. A. griseolus 

 grows on the higher mountains of Colorado. 



Colorado: Mt. Harvard, 1896, Clements jy (type); Twin 

 Lakes, 1 896, Shear J499. 



Aster Underwoodii sp. nov. 



Perennial with a horizontal rootstock ; stems simple up to the 

 inflorescence, 2-3 dm. high, often purplish, more or less hirsute - 

 strigose ; lower leaves spatulate or oblanceolate, tapering into a 

 winged petiole, glabrous except the ciliolate margin or slightly 

 pubescent when young ; the other stem-leaves sessile and the 

 uppermost linear-lanceolate ; inflorescence racemiform or corymbi- 

 form with 4-8 heads ; these fully 1 cm. high ; bracts oblanceolate, 

 the outer obtuse, the inner acutish, all with a rather thick green 

 tip, pubescent on the back ; rays purple or bluish, about 1 cm. 

 long and 1 — 1.5 mm. wide ; achenes hirsute. 



This is related to A. adseendeus and A. Ndsonii. From the 

 former it differs in the hairy bracts and from the latter in the broad 

 leaves. It suggests also A. griseus, but has shorter and almost 

 glabrous leaves. It grows at an altitute of 2500-3000 m. 



Colorado: Ironton Park, 1901, Underwood and Selby ji8 

 (type); Eldora to Baltimore, 1903, Tweedy 58 ji. 



Aster Osterhoutii sp. nov. 



Tall, branched and leafy, about I mm. high ; stem striate, 

 glabrous below, hairy in decurrent ines above ; leaves linear or 

 linear-lanceolate, 5-12 cm. long, 8 mm. wide or less, scabrous- 

 ciliolate on the margin, otherwise glabrous, entire-margined, sessile 

 and half clasping; those of the branches much smaller; inflores- 

 cence open-paniculate; heads nearly I cm. high; bracts in 4-5 

 series, the inner linear, acute, the outer oblanceolate, apiculate, 

 green and with white margins below ; rays white or rarely pinkish, 

 nearly 1 cm. long and fully 1 mm. wide. 



This species is related to A. salieifolius, but differs in the narrow, 

 thin, entire leaves. Mr. Fernald, to whom some of the specimens 

 had been sent, named it A. salieifolius caerulescens Gray, but that 



