460 Canadian Record of Science. 



covered in 1895 by Prof. John Macoun on Sheep Moun- 

 tain, Waterton Lake, Rocky Mountains, alt. 7,500 feet, 

 Lat. 49° 05'. Herb. No. 10,269. New to America. 



Lesquerella Ludoviciana, Wats. 



Specimens collected at Medicine Hat, Assa., by Prof. 

 John Macoun, in 1895, (Herb. No. 10,308) are the only 

 specimens in our herbarium that can be referred here. 

 The pubescence of the oblanceolate radical leaves is con- 

 spicuously stellate. 



Lesquerella Ludoviciana, Wats., var. arenosa, Wats. 



Vesicaria Ludoviciana, Macoun, Cat. Can. Plants, Vol. I., 

 p. 54, in part, and Vol. L, p. 490. 



From Western Manitoba to the Saskatchewan. The 

 reference under L. Ludoviciana, Wats., var. arenosa, Wats., 

 Macoun Cat. Can. Plants, Vol. II., p. 305, should go with 

 L. arctica, Wat. 



Sisymbrium virgatum, Nutt. 



In gravel amongst bushes, Police Point, Medicine Hat, 

 Assa. In fruit May 31st, 1894. Herb. No. 3,069; prairies, 

 12-Mile Lake, Wood Mountain, Assa., June 6th, 1895. 

 Herb. No. 10,007; meadows, Sucker Creek, Cypress 

 Lake, Assa., 1895. Herb. No. 10,006. (John Macoun.) 

 New to Canada. The Canadian specimens have longer 

 pedicels and pods and are more panicu lately branched 

 than those from the Pocky Mountains in the L T nited 

 States, but Dr. Kobinson, who examined our specimens, 

 has been unable to detect a single significant or constant 

 character to separate the plants from the two regions. 



Arabis Drummondii, Gray; Macoun, Cat. Can. Plants, 

 Vol. I., p. 43, in part. 



