NEW WESTERN SPECIES OF ROSA. 13 
R. PRATINCOLA. Almost herbaceous, and never more than 
suffrutescent, 1 or 2 feet high, usually flowering terminally 
and corymbosely from upright shoots of the season; bark 
of the stem green and glaucescent,the prickles dark purplish, 
all rather slender and weak, but some larger and less slender 
than others, all straight, spreading or slightly deflexed: 
leaves very ample for the plant; leaflets 7 to 11, obovate 
and oblong-obovate, sharply serrate, somewhat cuspidately 
acute, pubescent on both faces when young, the upper face 
glabrate in age; stipules very narrow and entire, soft- 
pubescent, but neitber glandular nor prickly, the rachis 
often setose-prickly ; receptacle smooth and glabrous, the 
sepals very woolly within and also marginally, the tips vil- 
lous on both sides, the back of the basal part glandular- 
hispid : achenes nearly smooth, but more or less hirsute on 
certain of the angles and about the base or summit. 
I thus designate unhesitatingly as a new species one of 
the commonest of North American roses, and one most 
abundantly inhabiting a very extensive range in the United 
States and Canada; a denizen of the prairie regions of the 
West and Northwest, from Illinois and Missouri to the Da- 
kotas and Manitoba. It has passed for Æ. Arkansana, and 
to that extent that probably almost all the so-called R. Arkan- 
sana of the herbaria of the country is of this species. It is 
found in eastern Kansas and Nebraska, but does not occur 
in Colorado, or anywhere very near its borders, in so far as 
we can ascertain. It is the peculiar rose of the rich grassy 
prairies of the upper Mississippi Valley ; and, though pass- 
ing usually for R. Arkansana, has been distributed by Sand- 
berg, from Minnesota, as R. humilis. It is, of course, a part 
of R. blanda of the earlier American authors, and of local 
botanists residing in the prairie regions. 
Probably no botanist knowing, as I know, both the Illi- 
nois and Wisconsin prairies, and the valley of the Arkansas 
in Colorado, could be brought to entertain the notion that 
any species of rose could be common to the two. The latter 
