144 Rydberg : Rocky Mountain flora 



description agrees with the original diagnosis of Aster occidentalis. 

 It may be that the plant described by Gray should receive a new 

 name. I have not seen Nuttall's type and shall await the chance 

 of seeing it before making such a change. 



Alberta: Laggan, Lake Louise region, alt. 1950 m., Aug. 

 23, 1902, Roscndahl 1089 (type, in herb. N. Y. Bot. Gard.) ; 

 also 1061. 



Idaho: Priest Lake, Aug. 1901, Piper 4120, 3723, 3682. 



Montana: Rost Lake, July 15-16, 1 90 1 , MacDongal 661 ; 

 Big Fork, July 24, 1908, Butler 697. 



Aster Umbachii sp. nov. 



Perennial, with a slender rootstock ; stem slender, erect, simple, 

 glabrous below, sparingly pilose above, 3-5 dm. high ; lower leaves 

 about 1 dm. long, petioled ; blades broadly oblanceolate or lance- 

 olate, dark green, more or less crenate, acute, glabrous, ciliolate 

 on the margins ; middle stem-leaves similar but the petioles with 

 dilated, clasping bases ; upper stem-leaves lanceolate, sessile ; heads 

 1-3 in a corymbiform inflorescence ; involucres 8-9 mm. high, 

 12-15 mm - broad; bracts in about 2 series, oblong-oblanceolate, 

 acute, not very unlike in length, glabrous, slightly ciliate, with 

 broad lanceolate green tips ; rays dark bluish-purple, fully 1 cm. 

 long ; achenes almost glabrous ; pappus tawny. 



This species is most nearly related to Aster ciliomarginatus 

 Rydb. {A. glastifolius Greene) ; but differs in the dark green and 

 mostly crenate leaves and broader and more conspicuously green- 

 tipped bracts. In A. ciliomarginatus the leaves are light green, 

 more or less glaucous and entire. 



Montana: River bank, Lake McDonald, Aug. 20, 1901, 

 Umbach 275 (type, in herb. N. Y. Bot. Gard.) ; also 267. 



Aster Mearnsii sp. nov. 



Perennial, with a rootstock; stem 3-10 dm. high, leafy, 

 branched, glabrous below, sparingly pubescent above ; leaves 

 linear, 5-10 cm. long, ascending-spreading, sessile, entire, gla- 

 brous and smooth beneath, scabrous or glabrate above, scabrous- 

 ciliolate on the margins ; inflorescence large, paniculate, leafy ; 

 heads numerous, disk about 8 mm. high and barely I cm. broad ; 

 bracts oblanceolate, acute, some longer than the disk ; rays about 

 8 mm. long, white or pinkish ; achenes strigulose. 



