Rydberg: 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. suffulta 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 as a 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 Canon, 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 Crepin 



Within the region it is found only in the northeastern wooded 

 region. 



