410 GEOLOGICAL SURVEY OF CANADA. 



around Prescott. {Billings.) In ditches along the G. T. Eailway, five 

 , miles below Shannonville Station, also along the Salmon Eiver, three 

 miles above the Eailway Bridge. {Macoun.) Vicinity of Toronto. 

 {A. Fowler.) Low grounds around Hamilton. (JLogie & Buchan.) 

 Niagara District and at Maiden. (Mdclagan.) Common at London 

 and "Windsor, Ont. (Saunders & Burgess.) 



(1881.) P. lapathifoilum, Ait. var. incanum, Koch. 



P. lapathifoUum, var. lanatum, Bourgeau, Palliser's Eep. 259. 



Apparently introduced eastward, but indigenous from Ontario west- 

 ward. On ballast heaps, Pictou, N. S. ; margins of pools and lakelets, 

 south of Battleford and at the Eed Deer lakes. {Macoun.) Saskat- 

 chewan region. {Bourgeau.) 



(1882.) P. amphibium, Linn. Water Persicaria. 



P. ampMUum, var. aqvaticum, Gray, Man., 416, 1868. 

 P. cucdnewm, Muhl. Cat. Holmes Herb., 16. 



In ponds and slow flowing water extending from Quebec and Ontario 

 westward across the continent to the Pacific. Swamp, St. Denis Street, 

 Montreal, 1821. (Holmes.) Quite common throughout Ontario and 

 in nearly all the fresh water ponds in the prairie region and interior of 

 British Columbia. 



(1883.) P. Muhlenbergii, Watson. 



P. amphibmm, var. terrestre, Gray, Man. 416, 1868. 



P. amphibium, var. p. Bourgeau, Palliser's Eep. 259. 



P. amphibium, var. terrestre, Macoun's Cat. No. 1509, in part. 



In ditches and on the borders of ponds at London, Ont. (Burgess.) 

 Abundant in dried up pools and on the margins of small brooks in the 

 prairie region from Moose Jaw Creek westward to Morley. (Macoun.) 

 Along Belly Eiver, near Fort McLeod. (Dawson.) Shallow water, 

 C6teau de Missouri, 49th parallel. (Burgess.) Saskatchewan region. 

 (Bourgeau.) Eather common in the Columbia Valley at Donald, B.C. 

 (Macoun.) 



(1884.) P. Hartwrightii, Gray. 



P. amphibium, var. terrestre of Canadian Botanists. 

 P. coceineum, var. terrestre, Cat. Holmes Herb., 16. 



Distinguished from P. amphibium by its foliaceous and ciliate sheaths, 

 on the other hand P. Muhlenbergii is without ciliate sheaths but is 

 rough with appressed hairs all over. This species is chiefly found 

 around ponds and in mud on the mai'gins of lakes. In marshes at 

 Salt Lake and Becscie Eiver, Anticosti, (Macmm.) Along the 



