4 
Colorado: Hall & Harbour, nos. 158 and 162, 1862 (both only 
in part); E. L. Greene. 
New Mexico: Wm. A. Bell (Ratan Mountains), 1867; G. Re 
Vasey (Las Vegas), 1867. 
-PoTentiLLA Lemmont (Wats.) Greene, Pittonia, 1: 104, 1887. 
Ivesia Lemmoni Wats. Proc. Am.Acad. 20: 365. 1885. 
This species should, I think, be placed as an appendix to this 
group. It has no relationship to any of the Ivesias, and is a true 
Potentilla in every respect, except as to the number of pistils, 
which are only half a dozen or so. Its nearest relative is, without — 
doubt, Potentilla crinita, from which it differs by the longer, nar- 
rower and fewer leaflets, the sparser pubescence, the few pistils- 
and the longer hairs on the receptacle. 
Graciles, This group is the most difficult in the whole genus. 
It contains so many and perplexing forms, that I have not yet come 
to any definite conclusion as to how to treat it. Watson united 
all except the first (partly) and the last into one species. This is far 
from satisfactory. It would have been much more logical to make 
P. effusa a variety of P. Hippiana, P. Breweri one of P. Plattensis, 
or P. emarginata one of P. fragiformis than to include P. Nuttalli 
and P. flabelliformis in P. gracilis, The group contains not less: 
than ten well marked American forms and about half a dozen less 
marked ones. Of these ten forms all except one have been recog- 
nized at one time or another as species or varieties, and as far as I 
know, all but two have received names. 
gard these ten as species. 
This view I dare to express, as I have had chance to study 
this group especially in the field. I have collected the following 
myself: P. pulcherrima, Blaschkeana, flabelliformis, var. ctenophora, 
Fastigiata, etomentosa and Nutiallit. 1 have seen the following grow- 
ing together: pulcherrima and Nuttallii, Blaschkeana and Nuttallii, 
Blaschkeana and flabelliformis, Blaschkeana and ctenophora, flabelli- 
formis and Nuttall. In no case have I found intermediate 
forms. In the herbaria that I have looked over I have found one 
specimen between Slaschkeana and ctenophora, a few between 
Nuttallii and Blaschkeana or fastigiata, etc., but asa vue ayes can 
be distinguished fairly well. ste 
I shall temporarily re- 
