SHORE OF LAKE HURON 53 



Island, Mackinac Count}'. Plentiful. Perhaps throughout but over- 

 looked. 



Euphorbia cyparissias L. Cypress spurge. Along roads, about cities 

 and villages, and in cemeteries. In spots abundant throughout. 



ANACARDIACEAE. Cashew Family 



Rhus typhina L. Staghorn sumach. Dryish open ground on borders 

 of woods. Frequent throughout. 



Rhus glabra L. Smooth sumach. Dry open ground from Bay County 

 to St. Ignace, Mackinac County. Plentiful. 



Rhus toxicodendron L. Poison ivy. In dry or damp open or shaded 

 1 ground. Common along and near the sandy beach of Lake Huron. 



AQUIFOLIACEAE. Holly Family 



Ilex verticillata (L.) Gray. Winterberry. Low open ground from Bay 

 County to Mackinaw City, Cheboygan County. Frequent. 



Nemopanthus m.ucronata (L.) Trel. Mountain holh r . Damp places 

 with other shrubs from Bay County to St. Ignace, Mackinac County. 

 Plentiful. 



CELASTRACEAE. Staff Tree Family 



Celastrus scandens L. Bittersweet. In woods and thickets. Common 

 throughout. 



ACERACEAE. Maple Family 



Acer pennsylvanicuni L. Striped maple. First noticed in a small 

 piece of timber about two miles north of Harrisville in Alcona County. 

 Common in woods with other trees from that point to St. Ignace and on 

 Mackinac Island. 



Acer spicatum Lam. Mountain maple. Damp woods and thickets. 

 Abundant throughout. 



Acer saccharum Marsh. Sugar maple. Rich ground. One of the 

 principal trees forming hardwoods and common throughout. Formerly 

 very abundant. 



Acer saccharinum L. Silver maple. Cultivated as an ornamental tree 

 in cities and villages but not noticed as escaping. 



Acer rubrum L. Red maple. Usually in damp rich ground with o1 her 

 trees. Plentiful from Bay County to St. Ignace, Mackinac County. 



Acer negundo L. Box elder. Cultivated as an ornamental tree in 

 cities and villages but apparently not spreading. 



SAPINDACEAE. Soapberry Family 



Aesculus hippocastanum L. Common horse-chestnut. Cultivated as 

 an ornamental street tree in cities and villages throughout, but appar- 

 ently not spreading. 



