42 GEOLOGICAL STIRVET OF CANADA. 



68°. (Richardson.) London and on the sands at Sarnia, Ont. (Burgess.) 

 At the Whirlpool, Niagara Falls. (Buchan.) Abundant on Point Pelee, 

 Lake Brie; from the Sault Ste. Marie to Pic River, Lake Superior; 

 Lake of the "Woods. McLeod's Lake, B. C. (Macoun.) 



(133.) A. petrsea, Lam. Eock-cress. 



Cookbui-n Island, Lake Huron ; York Factory. (R. Bell.) Crevices 

 of rocks about five miles north of Michipicotin Harbor, Lake Superior. 

 (Macoun.) Iltasyouco Eiver, B. C. (Dawson.) Throughout Canada, 

 extending westward to the Eocky Mountains, Lat. 55°-56°, and to the 

 islands of the Polar Sea. (Hooker Fl. I., 42.) Greenland. (Rook. 

 Arct. PI.) 



(134.) A. petrsea, var. ambigua, Eegel. 

 A. ambigna, DC. Hook. Fl. 1., 42. 

 Sandy and grassy places on the shores of the island of Ounalashka. 

 (Uhamisso.) In grassy places by brook sides near Yale, B. C, May 

 16th, 1875. It is desirable to obtain this in fruit, as there is some 

 uncertainty about the position of the species. 



(135.) A. hirsuta, Scop. Hairy Eock-cress. 



Turritis ovata. Pursh, 438. 



A. sagittata, DC. Buchan in Hamilton List. 12. 



A. rwpestris, Nutt. Torr. &. Gray Fl. I., 81. 



Turritis patula, PI. Bourgeau, 263 in jiart. 



A. Gerardi, var. borealis. Macoun's Cat., 136. 



Eel Eiver, Eestigouche ; on rocks, Portland, N.B. (Fowler's Cat.) 

 Collected in Madawaska, N.B. (Say.) Common on river banks and 

 amongst rocks from Gasp^ to the Pacific, and north to Lat. 68°. Sitka 

 and Ounalashka. (Roth. Alask.) 



(136.) A. Holboellii, Hornem. 



Turritis patula, Graham. Hook. Fl. I., 40. 



(?) Turritis mollis. Hook. Fl. 1., 40. 



Streptanthm angustifolius et virgatug, Nutt. Torr. & Gray, Fl. I., 76. 



(?) Arabis gpardflora, Nutt. Torr. & Gray Fl. I., 81. 



Very abundant in the sparsely wooded country from Manitoba west^ 

 ward, and through the valleys of the Eocky Mountains to British 

 Columbia, being abundant both at Spence's Bi-idge land in the neighbor- 

 hood of Victoria. A variety with very short stems and very hairy 

 root-leaves, occurs in the Bow Eiver Pass, also on the highest summits 

 of the Eocky Mountains about Lat. 55°, according to Drummond. It 

 extends north to Lat. 68° and shores of the Arctic Sea, Long. 10'7°-109°. 

 (Hooker.) Greenland, (Hook. Arct. Fl.) 



