RypBERG: Notes on RosAcEAE—XIV 67 
the glaucous foliage of R. conjuncta. Hence it must be regarded 
as a distinct species. 
15. ROSA POLYANTHEMA Lunell 
This species resembles R. suffulia in the leaf-form and 
inflorescence, but the plant is shrubby, the upper branches 
soon overtopping the inflorescence. It is known only from the 
type locality and vicinity. 
16. RosA ENGELMANNI S. Wats. 
In describing this species Dr. Watson included some eastern 
specimens which belong to R. acicularis. This has caused much 
confusion. Some botanists have regarded R. Engelmanni as a 
variety of R. acicularis, some asa mere synonym. R. Engelmanni 
is a purely Rocky Mountain species. The most eastern station 
from which the writer has seen the same is in the Black Hills 
of South Dakota. The specimens referred to it from Minnesota, 
Michigan and northern New York belong to R. acicularis. 
In R. Engelmanni the leaflets are much more rounded, without 
pubescence, but distinctly glandular-granuliferous beneath, 
usually double-toothed and with gland-tipped teeth. In R. 
acicularis on the contrary the leaflets are inclined to be elliptic, 
conspicuously pubescent but scarcely glandular beneath and 
with simple teeth. 
Most of the specimens seen of R. Engelmanni are from Colo- 
rado and a few are from southern Wyoming. The only specimens 
from the region here treated are the following, but even these 
are not from the prairies and plains but from the mountains or 
wooded hills. 
SoutH DAKoTa: Spearfish Cafion, Black Hills, Murdock 
4136; Rochford, Rydberg 676 (in part); Custer, Rydberg 676 
(in part). : 
17. Rosa acicuLaris Lindl. 
Within the region the species is found only in the northern 
wooded part. Among other specimens may be mentioned: 
MINNEsoTA: Sandy Lake, Sandberg 793. 
18. RosA BouRGEAUIANA Crépin 
Within the region it is found only in the northeastern wooded 
region. 
