RypBERG: Nores ON ROSACEAE 381 
page 25), after Clute had reported P. canadensis and P. pumila as 
growing together on the sand barrens of Long Island and were 
“connected through intermediate forms.’’ The page referred to 
contains the proceedings of the Club. I had nothing to do with 
it and my name was not even mentioned. Clute’s report on the 
sand barren flora contains a statement very opposite to what 
Dr. Wolf gives, viz.: ‘‘Potentilla pumila and P. canadensis growing 
together without intermediate forms.’’ Robinson and Fernald, 
who give Potentilla a very conservative treatment in Gray’s 
New Manual, keep them distinct, although they regard P. simplex 
a variety of P. canadensis. I for some time thought that an 
additional species could be distinguished from P. canadensts, viz., 
the plant common in the lower Mississippi Valley. This has 
much thicker and more shining leaves and usually longer bractlets 
than the common P. canadensis of the North Atlantic States, but 
these characters were found to be too unstable and the plant 
grades so into the typical form that the idea was given up. 
HETEROSEPALAE 
This group contains only one species from Mexico and Central 
America. Dr. Wolf refers it to the SUPINAE group, perhaps rightly 
so. 
; SUPINAE 
In the North American Flora 12 species are admitted. Of 
these, Potentilla rivalis, P. millegrana, P. biennis. P. michoacana 
and P. pentandra are regarded by Dr. Wolf as distinct species; and 
P. paradoxa and P. monspeliensis are regarded as varieties of the 
European P. supina and P. norvegica respectively. P. Nicolletii 
is made a mere form (f. decumbens) of P. supina paradoxa. A 
comparison between this treatment and the one in Gray’s New 
Manual is rather interesting. In that publication P. Nicolletii 
is regarded as a good species, while P. millegrana and P. pen- 
tandra are made varieties of P. rivalis. Whatever may be said, 
Potentilla Nicolletii is a rather weak species, while P. pentandra 
is one of the most distinct in the group. Opiz even based a new 
genus on the same. It is also interesting to know that the speci- 
-men which Sheldon had most in mind when he raised P. Nicol- 
letit to specific rank and which he distributed under that name, 
