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, 
Fig. 132.— Sand Rocket (Diplotaxis 
muralis). X 4. 
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 
