CRUCIFERAE (MUSTARD FAMILY) 



189 



lance-shaped in outline but deeply 

 and irregularly toothed or some- 

 what pinnatifid, narrowing to peti- 

 oles. Flowers in terminal racemes, 

 each about a half-inch broad, 

 golden yellow. Siliques about an 

 inch long, linear, somewhat flat- 

 tened and almost beakless, erect, 

 on very slender spreading pedicels ; 

 the two cells of the pod each con- 

 tain a double row of small reddish 

 brown, slightly flattened seeds. 

 (Fig. 132.) 



Means of control 



Prevent seed production by close 

 cutting or pulling before the first 

 flowers mature. 



HARE'S-EAR MUSTARD 



Conringia orientalis, Dumort. 



Other English names : Rabbit-ears, 

 Hare's-ear Cabbage, Klinkweed. 



Introduced. Annual and winter 

 annual. Propagates by seeds. 



Time of bloom : Late June to Sep- 

 tember. 



Seed-time: August to October. 



Range: Ontario and Manitoba, Minnesota and the Dakotas. 

 Appearing locally in other states and provinces. 



Habitat : Grain and flax fields ; waste places and along railways. 



Brought to this country in flax seed from Europe about 1892, 

 this weed has since spread through all the grain-growing section of 

 the Northwest and bids fair to be still more widely known. Autumn 

 plants send down a main root with many branching rootlets, and 

 form a tuft of thick, smooth leaves, three to six inches long, broadly 

 oval, rounded at tip and tapering toward the base, the edges entire, 

 and the surface covered with a bloom like a cabbage ; in fact the 



FIG. 132. Sand Rocket (Diplotaxis 

 muralis). X J. 



