RYDBERG: NOTES ON ROSACEAE 51 
name for the Swamp Rose, or what has usually been known as 
R. carolina, is thus R. palustris Marsh., a very appropriate name. 
The synonymy of this species is much involved; see North 
American Flora. 
West of Lake Michigan, especially in the Green Bay region, 
R. palustris has more pubescent, smaller, and less bluish green 
leaflets. This form may represent a distinct species or geograph- 
ical variety. 
II. ROSA DASISTEMA Raf. 
Some specimens, collected especially in Missouri and named 
R. carolina, differ from R. palustris in having a smaller hypanthium 
decidedly pear-shaped and acute at the base, instead of depressed- 
globose and rounded below, and also in having fewer leaflets, 
usually five, rarely seven, instead of seven or nine. These speci- 
mens agree closely with the description of R. dasistema Raf. 
The type of the latter was from Indiana, from which state I have 
seen no specimens. This fact, however, does not disprove the 
identity of the Missouri specimens with Rafinesque’s species. 
These specimens are: 
Missouri: Paw Paw Junction, Bush 226; Kennett, Trelease 
177; Campbell, Bush rog, 6214; Butte County, Bush 3688. 
12. ROSA GEMELLA Willd. 
Although this has usually been regarded as a synonym of 
R. blanda, the description shows that it can not be that species. 
The description of the prickles of R. gemella (slender and curved) 
would exclude it from R. blanda. There is, however, a plant, 
though rather rare, which answers Willdenow’s description. 
It is related to R. carolina, but differs in the curved prickles, the 
more corymbose inflorescence, and the entire sepals. It may be 
confused also with R. virginiana and R. palustris. From the former 
it differs in the thin dull leaflets, the slender more curved prickles 
and the low habit. Its prickles resembles those of R. palustris 
but are much weaker, while its leaflets are broad and rather short 
and more coarsely serrate. The following specimens belong here: 
Nova Scotia: Yarmouth, Howe & Lang 122. 
Massacuusetts: Ipswich, Nash, Morong; Provincetown, Hol- 
lick. 
