AND GENERA OF PLANTS. 307 
four slightly scabrous rays. Capituli sometimes as many as nine. The pe- 
duncles and upper part of the stem, from the smallness of the leaves, appearing 
almost naked. More or less puberulous. 
Erigeron purpureum.—Oregon and Upper California, common. 
y 
8. *attenuatum; stem elongated and slender towards the top, very hairy at 
base; radical leaves spathulate-lanceolate, dentate; flowers white, the rays 1 not 
much longer than the disk. 
Has. In Oregon and Arkansas Territory. Flowers white, and smaller than in EZ. purpureum, 
the whole plant more hairy. Perhaps a species. 
Erigeron pumilum. 
Has. Rocky Mountains of the Platte. Stems one to four-flowered, heads fastigiate.” Pappus 
single, of about twenty rays. ; 
Erigeron *beliidiastrum, ©; stem leafy, cory mbosely branched, hirsute ; leaves 
entire, linear-oblong, sessile, scabrous on the margin, attenuated below, the 
radical ones slender; involucrum hemispherical, sepals lanceolate acute; rays 
about the length of the disk. 
Has. On the borders of the Platte, within the Rocky Mountains. About a foot high, the leaves 
thickish and rather smooth, one to two inches long, two to four lines wide. Rays pale red, about 
as numerous as in the common daisy, rather short. Pappus simple, very deciduous, of about ten 
rays! The natural situation of this species is in the section Olygotrichium, but the pappus is 
simple ; and hence it appears that the pappus does not define the natural limits either in this or 
many. other genera of Compositx. 
Enijeron * cespitosum; ‘cwspitose, hirsute, and almost canescent with short 
hairs; stems decumbent, many from the same root, mostly one-flowered; leaves 
linear-sublanceolate, somewhat obtuse, those on the stem sessile, all entire; se- 
pals lanceolate acute; rays longer than the disk; achenium elongated, smooth. 
Has. On the summits of dry hills in the Rocky Mountain range, on the Colorado of the West. 
Flowering in August. Nearly allied to Z. Andicola. Equally hirsute, with close white hairs. 
Leaves about one and a half to two inches long by two lines wide, those of the root clustered; on 
the slender low stems few; stems occasionally two-flowered; involucrum short and hirsute. Rays 
forty to fifty, rather wide, often three-toothed, white or pale rose. Pappus simple, of about —s 
seabrous, slender bristles. An alpine species, with the flower as large as a daisy. 4 
