282 GEOLOGICAL SUBVET OF CANADA. 



338. PRENANTHES, Linn. (RATTLESNAKE-ROOT.) 



(1316.) P. alba, Linn. White Lettuce. 



P. rubricunda, Pursh. PI. II., 449. 



Nabalus albus, Torr. & Gray Fl. II., 480. Macoun's Cat, No. 1085. 



Open grounds and borders of woods. Newfoundland. {Oormach.^ 

 Apparently common tkroughout the country from the Atlantic pro- 

 vinces and Anticosti to the woods along the Saskatchewan. It is 

 probable that many of the eastern stations refer to the next species as 

 all our Gulf specimens certainly do. 



(1317.) P. serpentaria, Pursh. PL II., 499. Eattlesnake Boot. 



Nabalus albus, var. serpentaria, Torr. & Gray Fl. II., 480. 

 N. Fraseri, DC. Torr. & Gray Fl. H., 481, 



Newfoundland. (Cormack.') Shore of Anticosti, at Salt Lake, and 

 south westerly to West Point ; also on the cliffs along the Gasp^ coast 

 at Eivifire Pierce. (Macoun.) Vicinity of Quebec and at Sillery, Q. 

 (Shepperd.) Lake Hui'on. (Dr. Todd.) Vicinity of London, Ont. 

 {Burgess.) All the stem leaves are petioled in this species. 



Var. nana, Gray. 



Nabalus nanus, DC. Torr. & Gray Fl. II., 482. 



On exposed rocky points and mountain tops. Close to the sea at 

 the "Bake Apple Bog," Sydney Mines, Cape Breton; on exposed peaty 

 soil at South-West Point Lighthouse, Anticosti ; also on the summit of 

 Mount Albei-t, one of the Shickshock Mountains, Gasp^. {Macoun.) 

 Magdalen Islands, Gulf of St. Lawrence. {McKay.) 



(1318.) P. altlssima, Linn. Tall White Lettuce. 



Nabalus altissimus, Hook. FI. I., 294. Macoun's Cat., No. 1087. 



Newfoundland. (Cormack.) This species seems to have nearly the 

 same range as P. alba, but prefers a drier habitat and becomes more 

 plentiful in western Ontario. 



(1319.) P. racemosa, Michx. Fl. II., 84. 



Nabalus racemosus, Hook. Fl. I., 294. Macoun's Cat., No. 1086. 



Common on Anticosti and at Sydney mines. Cape Breton ; also at 

 the mouth of the Eestigouche, opposite Campbellton, N.B. (Macoun.) 

 Campbellton, N.B. (Chalmers.) At the mouth of the Kennebeccaais, 

 in crevices of rocks, N.B. (Fowler's Cat.) Montreal and St. John's, 

 Q. (Maclagan.) St. Helen's Island, xMoutreal. (McGill Coll. Serb.) 



