STUDIES IN THE COMPOSITAE. 175 
A. PEDICELLATA. Slender, more than a foot high, the 
stems with scattered spreading and rather conspicuous leaves 
instead of upright bracts: lowest leaves on short ascending 
branches hardly to be called stolons or surculi, small, oblan- 
ceolate, acute, nerveless, permanently tomentose on both faces 
and thin: heads on slender pedicels of 3 to 1 inch in length, 
thus forming a lax subcorymbose eyme: involucres short 
and subeampanulate, their bracts in only about 8 series, the 
tips of the inner narrow, acutish or obtuse: achenes obscurely 
5-angled as well as very minutely and sparsely granular. 
Collected in the Blue Mountains of Oregon, at “alpine” 
or perhaps subalpine elevations, by Mr. Cusick. 
The staminate plants of neither of these far-western species 
seem to be known. 
There are indications, in the herbarium of the U. 8, 
Museum, of yet another undescribed member of this group 
from the hills of western Nebraska, the specimens having 
been collected by Mr. Rydberg. But the two following, be- 
longing to western montane or subalpine districts, are found 
in the herbaria under names which appertain to Old World 
Species. 
A. PARVIFOLIA, Nutt. Trans. Am. Phil. Soc. vii. 406. A 
very characteristic species of the elevated plains and sub- 
alpine valleys of the whole Rocky Mountain region from 
New Mexico northward, well distinguished by Nuttall, yet, 
by authors of less knowledge and experience, referred since 
to A. dioica. In its form or variety ROSEA, it is a beautiful 
plant. It is readily distinguished from true A. dioica by its 
want of proper stolons, having short and suberect or at most, 
merely ascending, sterile basal branches instead of them. 
Also its leaves are without distinction of blade or petiole, 
small and narrow, and equally woolly, and permanently so, 
on both faces. The real American analogue of A. dioica 1s 
A. neglecta, these two differing chiefly in habit; but A. dioica, 
though with leaves glabrate above, has its own peculiar leaf- 
LRA EO EE 
Prrrowta, Vol. IIL. Pages 175-182. Issued 27 May, 1897 
24 4 
