Colorado : Hall & Harbour, nos. 158 and 162, 1862 (both only 

 in part) ; E. L. Greene. 



New Mexico: Wm. A. Bell (Ratan Mountains), 1867; G. R. 

 Vasey (Las Vegas), 1 867. 



PoTENTiLLA Lemmoni (Wats.) Greene, Pittonia, i : 104, 1887. 



A'^.Tzia; Z^;«;;z^;zz 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. 



Uraciles. 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. Brewed one of P. PlattensiSy 

 or P. emarginata one of P. fragiformis than to include P. Niittallii 

 and P. flabelliforuiis 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. I shall temporarily re- 

 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. pulcherrijiia, Blaschkeanayflabelliformis, vzx.ctenophora^ 

 fastigiata, etometitosa ami Nuttallii. I have seen the following grow- 

 ing together : pidcherrima and Nuttallii, Blaschkeana and Nuttallii^ 

 Blaschkeana and flahelliforinis , Blaschkeana and ctenophora, flabelli. 

 formis and Nuttallii. In no case have I found intermediate 

 forms. In the herbaria that I have looked over I have found one 

 specimen between Blaschkeana and ctenophora, a few between 

 Nuttallii and Blaschkeana or fastigiata, etc., but as a rule they can 

 be distinguished fairly well. 



