48 BOTANY OF MICHIGAN 



Spiraea salicifolia L. 'Meadow-sweet. In damp open or slightly 

 shaded ground. Common throughout. 



Sorbaria sorbifolia (L.) A.Br. Ash-leaved spiraea. Cultivated 

 throughout but apparently not spreading. 



Pyrus malus L. Common apple. In open ground on borders of woods 

 and about cities and villages. Plentiful throughout. Abundant on 

 Thunder Bay Island, Alpena County, where it seems to be stunted, 

 shrubs two feet high and spreading being in full bloom June 25, 1907. 



Pyrus arbutifolia atropurpurea (Britton) Robinson. Purple-fruited 



chokeberry. In very wet places and swamps. Frequent throughout. 



.Pyrus melanocarpa (Michx.) Willd. Black chokeberry. In moist or 



dryish open ground from Bay County to St. Ignace, Mackinac County. 



Plentiful. 



Pyrus americana Marsh. Americana mountain ash. First noticed 

 near Black River in Alcona Count}'. Occasional from there to Mackinaw 

 City, Cheboygan County. Apparently variable and approaching Sorbus 

 americana decora Sarg. See Manual of the Trees of North America, by 

 Prof. C. S. Sargent, page 357. 



Pyrus sitchensis (Roem.) Piper. Western mountain ash. West side 

 of Mackinac Island, Mackinac County. Forms approaching this species 

 noticed as far south as Alpena. 



Amelanchier sanguine a (Pursh) DC. Low juneberry. Open dry or 

 damp ground and along streams. Frequent throughout. See Rhodora, 

 Vol. 14-138. 



Amelanchier florida, Lindley. Round-leaved juneberry. Sandy open 

 ground near Alpena, Alpena County. Plentiful. See Rhodora, Vol. 

 14-143. 



Amelanchier canadensis (L.) Medicus. Common juneberry. Dryish 

 ground. Common throughout. 



Crataegus punctata Jacq. Large-fruited thorn. In open ground or 

 woods throughout. Plentiful. 



Crataegus douglasii Lindl. (C. brocJcwayae Sarg.) Douglas' thorn. 

 On Bois Blanc Island. Apparently infrequent. Dryish open or par- 

 tially shaded ground. 



Fragaria virginiana Duchesne. Common strawberry. This and the 

 following species were noticed in particular as very abundant, rank, 

 thrifty, and producing fruit in great abundance from Alpena to Macki- 

 naw City. 



Fragaria vesca americana Porter. American wood strawbeny. Very 

 common throughout in damp open or shaded ground. 



Waldsteinia fragarioides (Michx.) Trattinick. Barren strawberry. 

 Usually in shaded ground and noticed from Bay County to Mackinac 

 Island, Mackinac County. Frequent. 



