RYDBERG: Rocky MOUNTAIN FLORA 573 
NEBRASKA: Dismal River, 1893, Rydberg rarg (type) ; St. 
James, 1893, Clements 2626 , Pine Ridge, 1889, Webber; Cedar 
Island, 1854, Hayden, 
Sourn Daxora: Piedmont and Little Elk Creek, 1892, Ryd- 
berg 735; Cobbs Creek, 1894, Z. A. Williams. 
CoLorapo: Merker, 1902, Osterhout 2602; Walsenburg, 
1896, Shear 4774; Caiion City, 1896, Clements ror. 
Wyominc : Dayton, 1899, Tweedy 2631 and 2632. 
Suida stolonifera riparia var. nov. ~ 
Leaves usually oval or elliptic, acute, thinner, lighter green 
and less pale beneath than in the eastern type; bark on young 
twigs brownish ; Sepals and fruit smaller. 
In the field this variety looks very unlike the eastern S. 
Stolonifera, It grows as a high bush on river banks and is as far 
as I know not stoloniferous. In the eastern plant the leaves are 
comparatively thick, darker green above and very pale beneath, and 
the young shoots bright red. The plant of the interior may 
represent a distinct species, but on account of the lack of good 
diagnostic characters it is perhaps better to regard it at present as 
a variety of the eastern plant. The variety is the only form found 
in the region of the Rockies and the Great Plains. It is common 
from Manitoba, the Mackenzie River, to Alaska and south to 
Nebraska, Colorado and Arizona; as the type may be designated : 
Cororano: Crystal Creek, 1901, Baker 257. 
~ Aletes obovata sp. nov. 
leaves 1-2 dm lo i irs of leaflets; these 
9 . long, pinnate with 4-5 pairs o ; 
broadly obovate, its si long, more or less cleft and toothed 
With short ovate teeth, strongly veined beneath; scapes I-3 dm. 
neh round-angled and striate; bracts none; branches of the 
Umbel > ; 
mm. long and t. 5 mm. in diameter; ribs rather thick ; oil-tubes 
Tin the intervals, 2 on the commissure, rather large ; seed-face 
ony slightly concave. ; 
his species has been confused with the closely related A. 
@caults, which is easily distinguished by its rhombic, deeply cut 
