COMPOSITAE (COMPOSITE FAMILY) 515 



Soc. Wash. -17: 179. 1904. It is possible that this name should be retained 

 for the plants of our range and A. campestris restricted to the north Pacific 

 States.) Colorado to Montana and westward. 



16. Aster griseus Greene, Leaflets 1: 147. 1905. Stems decumbent or 

 ascending, 2-4 dm. high, branching, sparingly villous-hairy; foliage and 

 bracts pale as if glaucous, but finely strigose-pubescent : lowest leaves pb- 

 lanceolate, 5 cm. long; the cauline oblong-linear to linear; all obtuse, entire, 

 1-nerved, ciliate or ciliolate: heads of middle size; involucres broadly cam- 

 panulate or nearly hemispherical; the bracts imbricated in 3 series, erect, ap- 

 pressed even to the tips, the outer obovate, obtuse, the inner more elongated, 

 acutish, all pubescent and more or less ciliate: rays many, showy, pale violet. 

 Mountains of Colorado. 



17. Aster ptarmicoides T. & G. Fl. 2: 160. 1842. Rather rigid, 2-5 dm. 

 high, in a tuft, from smooth to puberulent, bearing a corymbiform cyme of 

 several or numerous heads : leaves firm, linear or the lower spatulate-lanceolate : 

 bracts of the involucre oblong-lanceolate, obtuse, thickish, rather rigid: rays 

 4-8 mm. long, broadish: pappus white, of rather rigid bristles, longer ones 

 manifestly clavellate at tip. (Unamia ptarmicoides Greene, Leaflets 1: 6. 

 1903.) From Colorado to the Saskatchewan and New England. 



18. Aster multiflorus Ait. Hort. Kew. 3: 203. 1789. Stem much branched 

 and bushy, grayish-strigose, 3-20 dm. high, the branches ascending or spread- 

 ing: leaves rigid, linear or linear-oblong, entire, mostly obtuse, sessile or 

 slightly clasping at the base, strigose or glabrate, those of the stem 1-2.5 cm. 

 long, those of the branches very small and crowded: heads 6-8 mm. broad, 

 densely crowded, nearly sessile; involucre turbinate, 4-6 mm. high; the bracts 

 coriaceous, pubescent, in 3 or 4 series, the short green tips obtuse or mu- 

 cronate, spreading: rays 10-20, white, 3-4 mm. long: pappus brownish-white; 

 achenes puberulent. In the northeastern part of our range to the New Eng- 

 land States. 



19. Aster hebecladus DC. Prodr. 5: 242. 1836. Stems erect, ascending or 

 decumbent, usually simple below, branched above, 4-7 dm. high, densely 

 hirsute with short divaricate hairs: stem leaves linear or oblong-linear, 

 3-6 cm. long, 2-3 mm. wide, rather firm, hirsute, with short spreading hairs, 

 acute with a short spinulose tip; those of the branchlets merging into the 

 bracts of the involucres: heads numerous; involucre, 5-8 mm. high; bracts 

 in 3-4 series, minutely spinulose-mucronate, very thick, hirsute especially 

 on the margin, with oval herbaceous tip: rays white, 5-7 mm. long: achenes 

 strigose. [A. crassulus Rydb. Bull. Torr. Bot. Club 28: 504. 1901; A. exiguus 

 (Fern.) Rydb. 1. c. 505; A. polycephalus Rydb. 1. c. 33: 153. 1906.] From 

 the Dakotas to Texas and New* Mexico. 



20. Aster commutatus Gray, Syn. Fl. 1: 185. 1884. Similar to the pre- 

 ceding species, except in the inflorescence ; the stem rough-pubescent or some- 

 times nearly glabrous, 4-7 dm. high, with ascending or divergent branches: 

 leaves linear or linear-oblong, obtuse, entire, sessile or slightly clasping at the 

 base; those of the stem 2-7 cm. long: heads larger than those of A. multi- 

 florus, 12-16 mm. broad; involucre 6-8 mm. high, the bracts squarrose-tipped 

 and sometimes foliaceous: rays 20-30, about 6 mm. long. (A. adsurgens 

 Greene, Pitt. 4: 216. 1900; A. incanopilosus Sheld. Bull. Torr. Bot. Club 

 20: 286. 1893; A.falcatus Lindl. T. & G. Fl. 2: 126. 1842, as to our range.) 

 Northwest territory to Texas and New Mexico. 



21. Aster Cordineri A. Nels. Bot. Gaz. 40: 64. 1905. Dark green and 

 seemingly glabrous but sparsely scabrous on the margins of leaves and in- 

 volucral bracts; stems 3-6 dm. long, generally simple below, racemosely 

 short-branched above, decumbent at base and either widely spreading or 

 nearly erect, often puberulent especially upward, very leafy: leaves broadly 

 linear, crowded, spinulose-tipped ; primary ones 4-7 cm. long, 4-6 mm. broad; 

 secondary ones similar but smaller, more or less fascicled in the axils: heads 

 solitary at the ends of the short, leafy, axillary, racemosely disposed branch- 

 lets, rather large; involucre nearly 1 cm. high and somewhat broader; bracts 

 erect, glabrate, dark green on the spatulate-linear blade, lighter at base, 



