282 GEOLOGICAL SURVEY OP CANADA. 



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



(laiG.) p. alba, liiiiii. While Lottuce. 



r. ruMcuuda, rursli. Kl. 11., 44!i. 



NalHilm alhus, Torr. *& Gray Fl. II., 480. IMacoun's Cat,, No. 1085. 



0})on ijroumls anil lionlons of woods. Novvfouiullaml. {('onnach.') 

 A}))mi'ontly eoiiimon throughout the countiy from the Atliintie pro- 

 viiuos and Anticosti to Iho woods along the Saskatchewan. It is 

 pi-ohable that many of the eastern stations refer to the next species as 

 all our ( Inlf specimens certainly do. 



(1.S17.) P. serpentaria, rmsh. Fl. II., 499. Rattlesnake Eoot. 



Xabaltts albu^, var. serpentaria, Torr. & Gray Fl. II., 480. 

 N. Frasen, DC. Torr. & Gray Fl. II., 481, 



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

 south westerly to AVest Point; also on the cliffs along the Gaspt^ coast 

 at Hiviere Pierce. (Macoun.) Vicinity of (Quebec and at Sillery, i^. 

 {Shi'jiperd.) Lake Huron. (Dr. Todd.) Vicinity of London, Out. 

 (^Bunjc^.) All the stem leaves are petioled in this species. 



Var. nana, Gray. 



Nahalm 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 Albert, one of the Shickshock Mountains, Gaspd. (Mdcoun.) 

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



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



Nabaltui aUissimm, Hook. Fl. I., 294. Macoun's Cat., No. 1087. 



Newfoundland. (Cormaek.) This species seems to have nearlj^ 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 Kennebeccasis, 

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

 Q. (Maclagan.) St. Helen's I.sland, Montreal. (McGlll Coll. Herb.) 



