COMPOS IT AE (COMPOSITE FAMILY) 513 



1. Aster angustus T. & G. Fl. N. A. 2: 162. 1842. Stems 1-3 dm. high, 

 branching, leafy, nearly glabrous, except that the linear chiefly entire leaves 

 are somewhat ciliate : numerous rather small heads disposed to be racemose- 

 paniculate; bracts of the involucre acute: corolla of the ray-flowers reduced 

 to the tube and much shorter than the elongated style. Wet saline soil; from 

 Colorado and Utah to the Saskatchewan and Minnesota. 



2. Aster frondosus T. & G. 1. c. 165. Stems 1-3 dm. high, branching from 

 the base, when low usually spreading, when taller the branches bearing nu- 

 merous spicately paniculate heads (of 8 mm. in height): outer bracts of the 

 involucre linear-oblong, obtuse, wholly foliaceous and loose, numerous: 

 rays in anthesis exserted, 2 mm. long, linear, pinkish-purple, always longer 

 than the style, but equaled or surpassed by the mature copious pappus. 

 Springy places and borders of pools; Wyoming and Colorado to the Sierras. 



3. Aster Engelmannii Gray, Am. Journ. Sci. II. 33: 238. 1862. Rather 

 tall and robust, green, puberulent to glabrous: leaves thin, ovate-oblong to 

 broadly lanceolate, 5-10 cm. long, the larger sometimes with a few small teeth, 

 upper acuminate: heads 12-15 mm. high; involucral bracts acute or acuminate; 

 some outer ones partly herbaceous, or with loose pointed tips; inner purplish: 

 rays 12-14 mm. long. Mountains of Colorado, Utah, and Wyoming, to the 

 Cascades. 



4. Aster elegans T. & G. 1. c. 159. Slender, 3-6 dm. high, mostly scabro- 

 puberulent: leaves thickish, pale, lanceolate, 3-5 cm. long, erect, the upper 

 apiculate-mudronate : heads several at summit of simple stem or branches, 

 comparatively small and few-flowered, 8-10 mm. high; involucral bracts all 

 close and conspicuously woolly-ciliate, barely acute, outer ovate, none with 

 pointed tips: rays rather few, about 8 mm. long. Mountains of Wyoming 

 and Montana to Nevada and Oregon. 



5. Aster glaucus T. & G. 1. c. 150. Throughout smooth and glabrous, 

 glaucescent or pale; stems 3-7 dm. high from extensively creeping filiform 

 rootstocks, branching, bearing several or numerous paniculate heads: leaves 

 thickish, lanceolate, 3-7 cm. long, 6-12 mm. broad, rather obtuse: involucre 

 imbricated in about 3 ranks: rays bright violet, 8-12 mm. long. Mountains 

 of Wyoming to Colorado and Utah. 



5a. Aster glaucus formosus A. Nels. Involucral bracts very broad and 

 obtuse (suborbicular), sometimes with a mucro. (Bucephalus formosus Greene, 

 Pitt. 4: 156. 1900.) Pagosa Peak, Colorado. 



6. Aster culminis A. Nels. Caudex low, woody; stems solitary from the en- 

 larged crown, rather stout, short-lanate, pubescent, 1 dm. or less high, bearing 

 a large solitary head: leaves linear, spatulate, 1-3 cm. long, mostly basal, 

 cinereous-hirsute to silky: involucral bracts loosely erect, broadly linear, silky, 

 short-lanate, all nearly equaling the disk: rays white, shading to violet: 

 achenes with short pubescence; pappus simple. (A. alpinus L. as to our 

 range.) Berthoud Pass, Colorado. 



7. Aster Kingii Eaton, Wats. Bot. King's Exp. 141. pi. 16. 1871. Caespitose, 

 5-12 cm. high: leaves mainly radical, spatulate, entire, or with few sharp 

 '/eeth, mucronate, thinnish, glabrous or nearly so, 3-6 cm. long: flowering 

 stems pubescent and above glandular, bearing solitary or 3-5 middle-sized 

 heads: involucre 8-10 mm. high, merely puberulent-glandular, hardly at all 

 viscid; the bracts linear-lanceolate with attenuate and squarrose-spreading 

 green tips: rays white. Utah, in the Wasatch Mountains. 



8. Aster andinus Nutt. Trans. Am. Phil. Soc. 7: 290. 1841. Dwarf, with 

 decumbent stems 5-8 cm. long, from filiform creeping rootstocks, bearing a 

 solitary comparatively large head: leaves 12 mm. long; radical and lower 

 cauline spatulate; cauline (2 or 3) linear-lanceolate: heads 8 mm. high: rays 

 (35-40) violet. " In the mountains of Wyoming, near perpetual snow " (Nut- 

 tall). It is a question whether this species has since been found, although 

 some specimens from the alpine regions of Colorado have been referred to it. 



9. Aster pauciflorus Nutt. Gen. 2: 154. 1818. Stems 2-5 dm. high from a 

 slender creeping rootstock, simple and bearing few heads, or branching above: 

 leaves moderately fleshy, linear, or the radical subspatulate or elongated- 



ROCKY MT. BOT. 33 



