1921] Fernald,— Expedition to Nova Scotia 189 



as on Prince Edward Island as often in wet boggy barrens as on drier 

 habitats. 



J. horizontals Moench. J. sabina, var. procumbens Pursh. Al- 

 though stated by Macoun to be "abundant on exposed slopes and 

 river banks from Anticosti, Nova Scotia, New Bruoswick" westward, 

 this species was not once met by our party in the southwestern coun- 

 ties. It s en headlands of the Bay of Fundy and Northumberland 

 Strait and on Sable Island and Cape Breton. 



Sparganitm AMERICANUM Nutt. Common throughout the prov- 

 ince, passing freely to var. ANDROCLADUM (Fngelm.) Fernald & Fames. 

 Seep. 14^. 



S. DIVKRSIFOLIUM Graebn. Apparently common thoughout the 

 province. 



S. divirsifolium, var. acaule (Beeby) Fernald & Fames. Fre- 

 quent. 



S. FLUCTUANS (Morong) Robinson. Deep water of Trefry's Lake, 

 Arcadia, Yarmouth Co. See p. 145. 



*S. minimum Fries. Apparently local: quiet pools in Little River 

 east of Tiddville, Digby Co. Previously collected by Nichols in a 

 brook, mountains west of Ingonish, Victoria Co. 



Potamogeton natans L. Frequent from Digby Neck to Cape 

 Breton. m 



*P. Oakksianus Robbins. Frequent in shallow peat- or sand- 

 bottomed lakes and pools of Digby and Yarmouth Cos. See pp. 

 14(i, 148, OM. Formerly collected at margin of Taylor's Lake, Sunny 

 Brae, Pictou Co. (//. St. .Ink,,, no. \\\7.\). 



P. ALPINUS Balbis. Seen by us only at Truro and Baddeck. See 

 j). 164. 



**P. PULCHER Tuckerm. Muddy cove in Lily Lake, Sandy Cove, 

 Digby Co. See p. 164. 



P. amp jfolius Tuckerm. Abundant in Sloane Lake, Pleasant 

 Valley, Yarmouth Co. 



P. graminei's L., var. graminifolius Fries. Nov. FL Suec. ed. 2, 

 Mo (1828) Robbins in Gray, Man. ed. 5, 487 (1807); Freyer, Journ. 

 Bot. xxx. MM, tt. 317, MIS (1892). P. gramineus, proles a. gramini- 

 folius (Fries) Aschers & Graebn. in Engler, Pflanzenr. i\". Fain. 1 1 : 

 86 (1907). P. gramineus, $. gramineus Laestad. Vet. Acad. Hand!. 

 (1825) 15;?, ace. to Fries., not P. gramineum[us] L. Sp. PI. i. 127 

 (1753) which, according to Freyer (Pot. Brit. Isl. 05), is P. hvicro- 

 phylhis Schreb. P. gramineus, var. (?) myriophyllus Robbins in 

 Gray, Man. ed. 5, 487 (1807). P. heterophyllus, var, graminij'oliu.s 

 (Fries) Wats. & Coult. in Gray, Man. ed. 0," 501 (1890). P. hetero- 

 phyllus of most recent American authors, not Sehreb. P. graitiini- 

 folius (Fries) Freyer, Pot. Brit. Isl. 04, t. M0 (1915).— Ponds, pools, 

 and streams, frequent. 



There has always been confusion as to the identity of the common 



