AND GENERA OF PLANTS. 293 



/?. * ciliatifoUus, leaves distinctly ciliated, stem not denuded and scapiform, 

 leaves more proportionate, upper part of the stem pubescent; sepals of the in- 

 volucrum similar, brownish, ciliate and subacute. 



Hab. With the above; probably a distinct species, but my specimens are not satisfactory. 



Aster ramulosus. Lind. in Hooker, Flor. Bor. Am. II., p. 13. Common 

 in the Rocky Mountain region, along the plains of Lewis' River. Flowers 

 pale purple. Radical leaves lanceolate, entire, attenuated into long petioles. 

 It bears not the most distant affinity with A. hie7inis, {A. incanus, Ph.,) which, 

 in fact, resembles Amellus more than Aster, and constitutes a distinct genus. 



Aster * campestris, somewhat minutely and viscidly pubescent, leaves linear- 

 oblong, subacute, entire and amplexicaule, obscurely three-nerved, radical, 

 lanceolate serrulate; capituli in narrow racemose panicles, the branches mostly 

 one-flowered; involucrum spreading, viscid, the sepals linear and very acute. 



Hab. With the above, which it closely resembles, but differs in being every where somewhat 

 pubescent and viscid, with a strong scent, and particularly in the distinctly veined, serrulate 

 radical leaves, and the obtuse, instead of the attenuated extremities of the stem leaves. Stem about 

 a foot high. Achenia nearly smooth; pappus brownish, scabrous. 



Aster *hracteolatus, stem pulverulently pubescent, leaves linear or oblong- 

 linear, acute and sessile, entire, radical. . . . ; flowers racemosely paniculate, 

 branches leafy, mostly one-flowered; involucrum smooth and leafy, spreading; 

 sepals oblong, somewhat acute, the lower series similar with the branch leaves. 



Hab. With the above, to which it is nearly allied, but remarkable by the smooth leaf-like invo- 

 lucrum. The radical leaves are unknown; flowers lilac-purple, rather large. Stem and branches 

 much more leafy than in the two preceding ; the leaves nearly all similar. — July. 



Aster Douglasii: Common in inundated tracts, and along the low banks of 

 the Columbia and Wahlamet. Scarcely distinct from some of the varieties of 

 A. Novi-Belgii, or A. luxurians, though in a large collection, that of the Schwei- 

 nitzian Herbarium, I find nothing exactly similar. — Flowering in August and 

 September. 



Aster * asperrimus, minutely hairy and very rough; stem elongated, subde- 

 cumbent, terminating in a few-flowered corymb; leaves entire, nearly similar, 

 oblong, obtuse, amplexicaule, lower ones spathulate; branches long and leafy, 

 the lateral one-flowered; the capituli large; involucrum loosely imbricate, 

 squarrose; rays elongated; achenium pubescent. 



VII. — 3 Y 



