SCHOOLCRAFT COUNTY AND VICINITY 103 



Britton). Black choke-berry. Damp open places especially on margins 

 of tamarack-black spruce swamps. Common especially about Manis- 

 tique. Ripe fruit black. 



Pyrus americana (Marsh) DC. (Sorbus americana Marsh). Ameri- 

 can mountain ash. Common on margins of woods. Often large, 50 feet 

 high and more. 



Amelanchier laevis Wiegand. Smooth-leaved juneberry. Borders of, 

 and in, rich woods near Lake Michigan shore. Plentiful. Noticed in 

 particular in the western part of Mackinac County, where many trees 

 were IS inches in diameter 4 feet from the ground and 50 feet high. S 

 Rhodora, Vol. 14, page 158. 



Crataegus punctata Jacq. Large-fruited thorn. Usually in (lamp open 

 or partially shaded ground. Frequent throughout. 



Crataegus douglasii Lindl. Douglas' thorn. (C. brockvjayat Sarg. . 

 Very probably to be found throughout in dry, damp, open or shaded 

 ground. Noticed in particular on Grand Island in Alger County. 



Fragaria virginiana Duchesne. Common strawberry. Common iu 

 both damp or dry open ground throughout. 



Fragaria vesca americana Porter. (F. americana (Porter) Britton). 

 American wood strawberry. In damp hardwoods and tamarack-black 

 spruce swamps. Frequent. 



Potentilla monspeliensis L. Rough cinquefoil. In open dry sandy 

 ground throughout. Frequent as a roadside and field weed. 



Potentilla argentea L. Silvery cinquefoil. Frequent in dry open 

 ground. 



Potentilla palustris (L.) Scop. (Comarum palustre L.). Marsh 

 cinquefoil. Very wet and swampy open places. Common. 



Potentilla fruticosa, L. (DasipJiora fruticosa (L.) Rydb.). Shrubby 

 cinquefoil. Wet or dry open ground. Often abundant. 



Potentilla, tridentata Ait. (Sibbaldiopsis tridentata (Soland.) Rydb.). 

 Three-toothed cinquefoil. Dryish sandy or gravelly open or partially 

 shaded ground throughout. Plentiful in spots. 



Potentilla anserina L. {Argentina anserina (L.) Rydb.). Silver-weed. 

 Usually in dry or damp open ground near Lake Michigan or Lake 

 Superior shore. Often abundant. 



Potentilla canadensis L. Common cinquefoil. Frequent in dry open 

 ground. 



Geum canadense Jacq. White avens. Frequent in and near hard- 

 woods. 



Geum strictum Ait. Yellow avens. Moist open ground. Plentiful. 



Geum rivale L. Purple avens. Damp open or partially shad* x 1 ground. 

 Frequent. 



Rubus idaeus aculealissimus (C. A. Mey) Regel & Tiling. (R. strigosus 



