SHORE OF LAKE HURON 39 



Mackinac County. Common and often abundant. C. umbellata (L.) 

 Nutt. Common bastard toad-flax, not noticed. 



LORANTHACEAE. Mistletoe Family 



Arceuthobium pusillum Peck. Dwarf mistletoe. On Picea canadensis 

 (Mill.) BSP., white spruce, Bois Blanc Island, Mackinac County. 

 Abundant. Probably throughout, but overlooked. 



POLYGONACEAE. Buckwheat Family 



Rumex britannica L. Great water dock. Wet, marshy, usually open 

 ground from Bay County to St. Ignace, Mackinac County. Frequent. 



Runiex crispus L. Yellow dock. A weed throughout in cities, village 

 and cultivated fields. Often plentiful in pastures. 



Rumex mexica?ius Meisn. Willow-leaved dock. Growing in large 

 bunches on and near sandy beach of Lake Michigan west of St. Ignace, 

 also on and near sandy beach, Bois Blanc Island, Mackinac County. 



Rumex obtusifolius L. Bitter dock. A weed along roads and near 

 dwellings throughout. Often plentiful in pastures and cultivated 

 grounds. 



Rumex acetosella L. Field sorrel. In cultivated grounds. Frequent 

 throughout and often abundant. 



Polygonum aviculare L. Knotgrass. About dwellings and in cities 

 and villages. Common. 



Polygonum erectum L. Erect knotweed. Roadsides and streets in and 

 near cities and villages. Frequent throughout. 



Polygonum ramosissimum Michx. Bushy knotweed. Sandy beach on 

 Bois Blanc Island, Mackinac County. Plentiful. Not noticed else- 

 where. 



Polygonum tenue Michx. Slender knotweed. Dry open sandy ground 

 from Bay County to Mackinaw City, Cheboygan County. Frequent. 



Polygonum lapathifolium L. Pale persicaria. Wet open places from 

 Bay County to Mackinaw City. Frequent throughout. 



Polygonum amphibium L. Water persicaria. About ponds, small 

 lakes, along slow streams, often floating in water. Plentiful. 



Polygonum amphibium hartwrightii (Gray) Bissel. Hartwright's 

 persicaria. Damp open ground on Bois Blanc Island, appearing quite 

 distinct. Plentiful in several places. 



Polygonum muhlenbergii (Meisn.) Wats. Swamp persicaria. Bay 

 County to St. Ignace, Mackinac County. Plentiful. 



Polygonum pennsylvanicum L. Pennsylvania persicaria. Damp open 

 places. Frequent throughout. 



Polygonum hydropiper L. Common smartweed. Damp open ground 



