no OEHI.OGirAL SURVEY OF CANADA. 



ai-onnd Prosoott. (BiUim/s.) In ditches alonj^ the G. T. liailway, tivo 

 miles below Shannonville Station, also along the Salmon River, throo 

 miles above the Railway Jiridge. (^Macotin.) Vicinity of Toronto. 

 (A. Fowler.) Low grounds around Hanullon. (Logic li- Bucha7i.) 

 Niagara Disti'ict and at Maiden, (^raclagan.) Common at London 

 anil Windsor, Out. (Saunders «C' Burgess.) 



(1881.) P. iapathifoilum^ Ait. vai-. incanum, Koch. 



P. lapathifolitnn, var. l<mntum, Bonrjieau, PaUisor's Rep. 25i). 



Aj>})arently intnuhued eastward, but iiidigi'uous I'roni Ontario west- 

 ward. On ballast hca]i8, Pictou, N. S. ; margins of pools and lakelets, 

 south of Battlefortl and at the Red Deer lakes. (Macoun.) Saskat- 

 chewan region. (Bourgcau.) 



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



P.amphihium, var. arjuaticum, Gray, Man., 416, 1868. 

 P. coccincmn, Miihl. 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 thi'oughout Ontario and 

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

 British Columbia. 



(1883.) P. Muhlenbergii, Watson. 



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



P. amphiinum, var. (3. Bourgeau, Palliser's Rep. 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 River, near Fort McLeod. (Dawson.) Shallow water, 

 Coteau de Missoui-i, 49th parallel. (Burgess.) Saskatchewan region. 

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

 (Macoun.) 



(1884.) P. Hartwrlghtil, Gray. 



P. amphibium, var. terrestre of Canadian Botanists. 

 P. coccineum, 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 margins of lakes. In marshes at 

 Salt Lake and Becscie River, Anticosti, (Macoun.) Along the 



