CRUCIFERAE (MUSTARD FAMILY) 195 
Means of control 
Harrow autumn rosettes from the crop in the spring, when the 
grain is but a few inches tall. Spray the young flowering stalks 
with Iron sulfate or Copper sulfate at the appearance of the first 
yellow blossoms. Destroy waste-land plants by deep cutting or 
hand-pulling. 
WORMSEED OR TREACLE MUSTARD 
Erysimum cheiranthoides, L. 
Introduced. Annual or winterannual. Prop- 
agates by seeds. 
Time of bloom: June to August. 
Seed-time: July to September. 
Range: Newfoundland to Alaska, southward 
to North Carolina and Tennessee. 
Habitat: In fields and along streams. 
The foliage and, particularly, the seeds of 
this weed are very bitter, and when milch 
eattle eat it the dairy products are much 
damaged; also its juices are said to be so 
irritating to mucous surfaces as to bring about 
serious bowel disorders in stock. Its Greek 
name means “to draw blisters.” 
Stem eight inches to two feet tall, slen- 
der, and branching. Leaves lance-shaped to 
linear, entire or sparingly toothed, the lower 
ones tapering to a short petiole, the upper 
ones sessile; the whole plant minutely rough- 
ened with fine, forking hairs. Flowers about © 
a quarter-inch broad, bright yellow; racemes 
slender, the siliques four-sided, narrow, smooth, 
a half-inch to an inch long, held erect on 
divergent pedicels, making a noticeable elbow 
between the pod and its stem. Seeds small, 
reddish yellow, varying in shape from being 
crowded in the pods but approaching a flat- 
Fie. 138. — Worm- 
z 5 seed Mustard (Erysi- 
tened oval; too often an impurity among mum cheiranthoides). 
clover seeds. (Fig. 138.) Xd. 
Means of control the same as for Field Peppergrass. 
