[161] 



SYNOPSIS OF THE FLORA OF THE VALLEY OF 

 THE ST. LAWRENCE AND GREAT LAKES, 



WITH DESCRIPTIONS OF THE RARER PLANTS. 



BY JOHN MACOUN, M.A., Botanist to the GzologicaJ, Survey. 



AND 



JOHN GIBSON, B.A., F.G.S., F.B.S.E. 



(Continued from page 66.) 



SiSYi^BRiUM, L. Hedge Mustard. 



S. officinale, Scopoli. Officinal Hedge Mustard. 



Naturalized from Europe. Waste places, roadsides, and iu the vicinity of 

 barn-yards. Common at Belleville and Owen Sound (Macoun). Waste places 

 everywhere, London, Ont. (Saunders). Common near Prescott (Billings). 

 Vicinity of Montreal (Brunet). Roadsides, Hamilton, Ont. (T.ogie). Maiden, 

 Ont. (Maclagan). Waste places, Bayfield, County Huron, Ont. (Gibson). 



S. SopMa, L. Flax weed. 



Introduced from Europe. Waste places. Borders of fences near Quebec 

 (Brunet). Montreal (Maclagan, Mrs. Percival). East Street, Prescott (Billings). 



S. canescens, Nutt. Sickle-pod. Tansy Mustard. 



Indigenous. Dry, rocky ground. Montreal, St. Helen's Island (Maclagan). 

 Little Current, Georgian Bay (Macoun). Whisky Island, Lake Huron (Dr. 

 Bell). North shore of Lake Superior (Agassiz). Saskatchewan plains (Bour- 



§eau). Fort Edmonton, on the Saskatchewan ; Mosquito Prairie, near Fort 

 t. John, Peace River; Telegraph Trail, Upper British Columbia (Macoun). 

 Arctic America (Hooker). 



Brassica, Tourn. True Mustard. 



B. sinapistrum, Boissier. "Wild Mustard. 



Introduced from Europe. Waste places, roadsides, and cultivated fields. 

 West to Lake Superior (Macoun). 



B. alba, Boissier. White Mustard. 



Introduced from Europe. In cultivated grounds. New Brunswick (Dr. 

 Fowler). Vicinity of Quebec (Brunet). 



