408 GEOLOGICAL SURVEY OF CANADA. 



(1871.) P. minimum, Watson. 

 Slopes of the South Kootanie Pass, 49th parallel. (Dawson.) 



(18*72.) P. maritimum, Linn. Coast Knotgrass. 

 P. aviculare, var. littorale, Gray, Man. 374, 1856. 



Coast of Anticosti at Jupiter Eiver and at North Sydney, Cape Breton. 

 (Macoun.) On Amherst and Grindstone Islands, Magdalen Islands, 

 Gulf of St. Lawrence. (McKay & J. Richardson.) Sea-shore at 

 Arisaig, N.S. (McKay.} Sandy sea-shore at Halifax, N.S. (Sommers.) 

 Sandy sea-shore at Bass Eiver, Kent Co., N.B. (Fowler's Cat.) Sandy 

 shore, Bic, River St. Lawrence, Q. (Pringle.) On sand along the 

 Penticate Eiver, Q. (St. Cyr.) 



(1873.) P. ramosissimum, Michx. 



Sandy shores or dessicated places, principally westward. Sandy 

 shores, Manitoulin Island and Parry Sound, Ont. (Burgess.') Mouth 

 of Mississaugi Eiver, growing in crevices of rocks. (J. Bell.) Washow 

 Bay and other points on Lake Winnipeg. (J. M. Macoun.) Abundant 

 from Winnipeg to the Eocky Mountains, especially on the margins of 

 dried up pools. (Macoun.) South Fork of Old Man Eiver, Eocky 

 Mountains. (Dawson.) Sparingly in the Columbia Valley at Donald, 

 B.C. (Macoun.) 



(1874.) P. tenue, Michx. 



On sandy or rocky places from Ontario to the Pacific. Eocky bank 

 of St. Lawrence, two miles west of Brockville. (Billings.) Crevices 

 of rocks, Kingston Mills. (Maclagan.) Crevices of Laurentian rocks 

 at Shannonville, Hastings Co. (Macoun.) Amongst rocks, Muskoka, 

 Ont. (Burgess.) Lake of the Woods, and in the Foot Hills of the 

 Eocky Mountains. (Dawson.) Crevices of rocks, Eat Portage ; also 

 occasionally in the prairie region to the Eocky Mountains. (Macoun ) 

 Occurs rather frequently on the Souris Plain. (J. M. Macoun.) Sas- 

 katchewan region. (Bourgeau.) On gravel and sand, Thompson Eiver, 

 B.C. (Hill.) Lytton, Spence's Bridge and Kamloops, B.C. (Fletcher.} 



Var. latifolium, Bngelm. 



Upper part of South Kootanie Pass, 49th parallel. 1883. (Dawson.) 



(1875.) P. coarctatum, Dougl. 



Northward to British Columbia. ( Watson.) Prairi es at Nasqually Bay, 

 North-west coast. (Tolmie.) 



