Potentilla 



Rosaceae 



567 



grow. I found that the leaves varied in pubescence from nearly glabrous 

 in the wettest situations to silky-pubescent in the driest places. 



Greenland and Lab. to Alaska, southw. to n. N. J., Pa., Ohio, Ind., 111., 

 Iowa, Wyo., and Calif. 



5. Potentilla recta L. Map 1154. This species is rapidly becoming 

 established in all parts of the state and has in some parts already become 

 an annoying weed. Our first report dates back to 1905. In 1915 I made 

 a note that I saw it only once during the year although I had driven more 

 than 5000 miles. Now it has become more frequent along roadsides and 

 in pasture fields and meadows. 



Nat. of Eu. ; Maine to Mich., southw. to Va. and 111. 



6. Potentilla monspeliensis L. (Rhodora 28: 214. 1926.) (Rhodora32: 

 254. 1930.) Rough Cinquefoil. Map 1155. This species is a frequent to 

 common weed throughout the state. It is found in almost all kinds of 

 habitats but it is not frequent in certain bottomlands. I have specimens 

 from roadsides, cultivated and fallow fields, pastures, open woods, dry 

 dunes, and a dense tamarack bog. It is a pernicious weed, especially in 

 clover fields because its seed are separated from clover seed only with 



difficulty. 



Lab. to Alaska, southw. to D. C, Mo., Kans., and N. Mex. ; also in Asia. 



7. Potentilla argentea L. Silver Cinquefoil. Map 1156. This species 

 is restricted to dry, sandy or gravelly areas in the lake region where it is 

 more or less frequent along roads and in pastures and open woodland. 



N. S. to N. Dak., southw. to D. C, Ind., and Kans.; also found in Eu. 

 and Asia. 



8. Potentilla simplex Michx. var. typica Fern. {Potentilla canadensis 

 L. of Gray, Man., ed. 7 and Britton and Brown, Illus. Flora, ed. 2, in the 

 major part.) (Fernald. Potentilla canadensis and P. simplex. Rhodora 

 33: 180-191. 1931.) Common Cinquefoil. Map 1157. Frequent to com- 



