382 Rydberg : Notes on Rosaceae 



was not a specimen of P. supina Nicolletii S. Watson or P. Nicol- 

 letii of my monograph, but of P. millegrana. 



Dr. Wolf claims that Potentilla labradorica Lehm. is but a 

 depauperate form of P. norvegica hirsuta {i. e., of P. monspeliensis) . 

 Lehmann's description, however, suggests another plant, differing 

 from that species not only in the almost complete lack of pubes- 

 cence but also in the obtuse and oval instead of lanceolate bract- 

 lets, the broader obcordate petals and smooth instead of rugulose 

 achenes. It is a subarctic plant and evidently the same as P. 

 fiexuosa Raf., an older name. 



The remaining species, Potentilla flavovirens, P. Kelseyi, and 

 P. leurocarpa were described as new in the North American Flora, 

 and were evidently unknown to Dr. Wolf. They are all three 

 very local. P. Kelseyi may be a hybrid between P. biennis and 

 P. monspeliensis. 



Arenicolae 



This contains only one species, P. Neivberryi, which Dr. Wolf 

 includes in the preceding group. 



Argenteae 



This group is a rather artificial one and if I had had Dr. Wolf's 

 monograph at hand when the manuscript was prepared I should 

 have made other arrangements. The group consists of four in- 

 troduced species. Of these Dr. Wolf has placed Potentilla inter- 

 media in the Supinae group on account of its short style. It is 

 evidently related to that group and often closely resembles P. nor- 

 vegica but is an evident perennial. Most specimens of this species 

 collected in this country belong to a form with the leaflets more 

 deeply dissected and inclined to be more or less pedately instead 

 of strictly palmately arranged. This form was described as 

 P. digitato-flabellata, from seed said to have come from America. 

 Perhaps it is a native and distinct from the European species. 

 I have never seen it growing. It would be worth while for bot- 

 anists who have the opportunity to see it in the field to give it a 

 thorough study. P. argentea is rather common and is found in 

 this country in many forms. I did not take the trouble to try to 

 identify these with the numerous described varieties. 



