CATALOGUE. 151 



oblong-spatulate, thickish, roughish-pubescent. Leaves 6" long and 1-2" 

 wide, with fascicles of smaller ones in their axils. — Arizona coll., Oscar 

 Loew. The Expedition has also a variety from Utah, which I have not seen. 



Aster glacialis, Nutt. — Utah. 



Aster elegans, T. & G., var. Engelmanni, D. C. Eaton. (Aster Engel- 

 manni, Gray.) — Utah. 



Aster Douglasii, Lindl. 1 — San Luis Valley, Colorado (500). Scales of 

 the involucre narrowly lanceolate, very acute, with a narrow chartaceous mar- 

 gin; leaves 2-4' long, 2-5" wide, with the margins distinctly hispidly ciliate. 



Aster salsuginosus, Richards. — (486, 520, 516, 504.) From Colo- 

 rado, and all good representatives of the species. Number 521, however, 

 differs widely in appearance, both in the dried and living states, from the 

 others, and might even by many be regarded as a distinct species compared 

 with 516 and 520. It is shorter, much more leafy, with the scales of the 

 involucre oblong, obtuse, and almost smooth, except on the ciliate margins; the 

 rays are wider, shorter, and more deep purple, to say nothing of its having 

 a broader and smoother achenium. I do not, however, regard it as even a 

 good variety, for all (516, 520, and 521) were obtained from a single clump 

 in a cool, shady location at 11,300 feet, on Union Creek Pass, in Colorado. 



Aster pauciflorus, Nutt. — Stem erect, simple, 1-2° high, smooth 

 below, puberulent or viscidly puberulent above ; stem-leaves linear, 2-6' 

 long, 1-2" wide, indistinctly 8-nerved; entire margins thickish and smooth, 

 becoming gradually reduced to subulate bracts above ; heads few, terminat- 

 ing the branches, 3-5" in diameter; scales of the involucre in about three 

 series, acutish, viscidly puberulent ; rays purple, twice as long as the disk- 

 flowers; pappus light-colored, almost in a single series and nearly as long 

 as the disk-flowers. — San Luis Valley, Colorado (508). 



Aster spinosus, Benth. — Stem much branched, glabrous, striate, sub- 

 angular above and terete below ; leaves few, scattered, and reduced to 

 subulate scales, 1-3" long; heads solitary (rarely racemose), terminating the 

 branches ; scales of the involucre not longer than the disk, in three series, 

 acute, and with scarious margins ; achenia glabrous. — A most peculiar- 

 looking plant extending across the southern part of the continent, from 

 Texas to California ; Southern Arizona (769). 



