CATALOGUE OP CANADIAN PLANTS. 353 



(ISTS.) P. lapathifolium, Linn.; Gray, Man., ed. VI., 440. 



P. nodosum, Pers. & P. incarnatwm, Macoun, dat. III., 409, in part. 



Spikes oblong to linear (J-2 in. long), dense, erect, or nearly so. 

 Our herbai-ium specimens are from Brackley Point, Prince Edward 

 Island ; Norton, N.B. ; Lake Nepigon, Out. ; Qu'Appelle, and Devil's 

 Lake, Assiniboia ; Kicking Horse Lake, Eocky Mountains ; Indian 

 Eeservation, Kamloops, B.C. ; and Cowichan Eiver, Yancouver Island. 

 (Macoun.) 



Var. incarnatum, Watson, Gray, Man., ed. VL, 440. 



P. incarnatum, Macoun, Cat., III., 409. 



Spikes more slender and elongated (2-4 in. long), nodding. Our 

 herbarium specimens are from Hull near Ottawa; Belleville, Hastings 

 Co., Ont. ; Kew Gardens, Toronto ; Saskatchewan Eiver ; and Port 

 Moody, B.C. (Manoun.) 



Var. incanum, Koch.; Macoun, Cat, III., 410. 



Leaves small, obtusish, more or less hoary beneath, with floccose 

 tomentum ; spikes short. Our specimens are from Seymour, Jifor- 

 thumberland Co., Ont. ; Gull Island, Lake ISTepigon ; Muskeg Island, 

 Lake Winnipeg ; Medicine Hat, Assiniboia. (Macoun.) 



(1880.) P. Muhlenbergii, Watson; Gray, Man., ed. VI., 441. 



P. Muhlenbergii, Macoun, Cat., III., 410, in part. 



Decumbent or sub-erect, scabrous with short appressed hairs. Wet 

 places, London, Ont. (Burgess.) On the Indian Eeservation, Kam- 

 loops, B.C. 1889. (Macoun.) The latter specimens are without flowers 

 and much more hairy than those from London. 



(33Y9.) P. emersum, Muhl. ? 



Differs from P. Muhlenbergii, in having the leaves much rougher 

 with appressed hairs ; lower sheaths and petioles quite smooth and 

 the upper part of the stem and flower spike covered with glandular 

 hairs. Under side of petiole and midrib of leaf quite hairy. Our speci- 

 mens are from Short Creek and Moose Jaw and Thunder creeks ; also 

 Tail Creek and Belly Eiver. This is the common Polygonum along all 

 the streams throughout the prairie region. 



