Prom the Kullktin op the Torrey Botanical Clib28: 351-367. 1911 J 



Notes on Rosaceae — VI 



Per Axel Rydberg 



ARGENTINA 



In an article in Rhodora for January 1909, Prof. M. L. Fernald 

 discussed "The Representatives of Potentilla Anserina in Eastern 

 America." The second paragraph of his article reads as follows: 

 "In November, 1908, two extensive monographs of Potentilla 

 appeared, but when one turns to these two treatments with the 

 hope of settling his long-standing problems the results are cer- 

 tainly disheartening." And then, "after spending some days* in 

 the study of the material in the Gray Herbarium and the Herbarium 

 of the New England Botanical Club,' 1 '' he solves the problems. 

 Fifteen years have now passed since I began my work on Potentilla 

 and Dr. Th. Wolf has devoted longer time than that to the study, 

 and neither of us has definitely settled the status of the different 

 forms of this group. When the manuscript of my monograph in the 

 North American Flora went to press I had seen not only the col- 

 lection in the Gray Herbarium but also those of the New York 

 Botanical Garden, Columbia University, United States National 

 Herbarium, Philadelphia Academy, and the College of Pharmacy, 

 New York. When preparing my original monograph, printed in 

 1898, I had also seen the collection of the Missouri Botanical 

 Garden. Besides, many of the critical species had been sent to 

 me for determination by the University of California, Mr.T. S. 

 Brandegee, Mr. Parish, and many others. 



* Italics are mine. 



351 



