62 RYDBERG: NOTES ON ROSACEAE 
received later, which are in the herbarium of the New York Bo- 
tanical Garden, do not resemble R. palustris so much, but the dis- 
tinctive characters are there. Besides the Green Bay specimens, 
there is also one from Neenah, Wisconsin. 
VII. PIMPINELLIFOLIAE 
One species. 33. R. pimpinellifolia. 
33. ROSA PIMPINELLIFOLIA L. 
As stated before, Linnaeus included this species under R. 
spinosissima in the first edition of the Species plantarum, but it 
is not the type of it. See the remarks under R. spinosissima. 
Many recent authors have readopted the name R. pimpinellifolia 
for the present species. I am glad that the latter name, which 
has been in use for this species during a hundred and fifty years, 
is to be taken up again. 
R. pimpinellifolia is extensively cultivated and has escaped in 
many places. It has been mistaken for a native more than once. 
Pursh described it as R. lutescens, and lately E. G. Baker has given 
it another name, R. illinoensis. The latter was based on speci- 
mens collected, according to Baker, by Green, Lansing and Dixon 
at La Salle, Illinois. There is a sheet in the herbarium of the 
New York Botanical Garden, collected by Greenman [not Green], 
Lansing and Dixon. Baker distinguished it from R. spinosissima 
(i.e., from R. pimpinellifolia) by the smaller number of leaflets, 
only seven and by the upper prickles being paired under the leaves. 
In our specimens, some leaves have nine leaflets, while some of the 
upper leaves have only three or five. We have also some speci- 
mens from England and Scandinavia, which do not have more than 
seven leaflets. The arrangement of paired infrastipular prickles, 
I think, was only incidental, for our specimens, duplicates of the 
type, do not show this characteristic. R. illinoensis is nothing 
but the escape of one of the numerous cultivated forms of P. 
pimpinellifolia. The following American species belong to this 
species: 
VERMONT: Johnson, Grout, 
Ontario: Amherstbough, Macoun 34752. 
ILLinots: La Salle County, Greenman, Lansing & Dido 133: 
