SHORE OF LAKE HURON 49 



Potentilla monspeliensis L. Rough cinqucfoil. About cities and vil- 

 lages and in cultivated grounds. Frequent. 



Potentilla argentea L. Silvery cinquefoil. In dry open ground through- 

 out and often abundant. 



Potentilla palustris (L.) Scop. Marsh five-finger. Wet swampy 

 ground throughout. Common. 



Potentilla fruticosa L. Shrubby cinquefoil. In damp open ground 

 throughout. Frequent. 



Potentilla tridentata Ait. Three-toothed cinquefoil. Abundant in 

 a dry old field near Oscoda, Iosco County. Not noticed elsewhere. 

 Very probably overlooked. 



Potentilla anserina L. Silver weed. In dry sandy open ground usually 

 on or near the sandy beach of Lake Huron. Noticed as a bad field weed 

 near Alpena. 



Potentilla canadensis L. Five-finger. In dry open ground from Bay 

 County to St. Ignace, Mackinac County. Frequent. 



Geum canadense J acq. White avens. In rich open woods throughout. 

 Plentiful. 



Geum virginianum L. Rough avens. Damp open ground in Alpena 

 and Presque Isle counties. Apparently infrequent. 



Geum strictum Ait. Yellow avens. In damp meadow-like ground. 

 Plentiful throughout. 



Geum rivale L. Water avens. Damp open or rich shaded ground. 

 Frequent throughout. 



Rub-us idaeus acideatissimus (C.A.Mey.) Regal & Tiling. Wild red 

 raspberry. Common throughout in dn^ open or shaded ground. 



Rubus occidentalis L. Black raspberry. In damp rich shaded ground 

 from Bay County to Mackinaw City. Plentiful. Also near Rose City, 

 Ogemaw County. 



Rubus odoratus L. Purple-flowering raspberry. First noticed near 

 Alpena and from there quite frequent to a short distance north west of 

 Rogers where the next species apparently takes its place. For several 

 miles the two species intermingle. Probably frequent from Bay ( 'utility 

 to Presque Isle County. Southern limit on east side of Michigan appears 

 to be near Port Huron, St. Clair County. 



Rubus parviflorus Nutt. Salmon berry. First noticed a few miles 

 northwest of Rogers in Presque Isle County. Within a few miles the 

 change from the preceding to this species is quite complete. Here il is 

 a vigorous shrub with pure white flowers often over two inches in di- 

 ameter. Common from this point to St. Ignace and on Mackinac Island, 

 Mackinac County. 



Rubus triflorus Richards. Dwarf raspberry. In wet shaded ground. 

 Common t hroushout . 



