178 CRUCIFERAE (MUSTARD FAMILY) 
GREEN-FLOWERED PEPPERGRASS 
Lepidium apétalum, Willd. 
Introduced. Annual and winter annual. Propagates by seeds. 
Time of bloom: May to August. 
Seed-time: June to September. 
Range: Maine, New York, and Ontario, to the Northwest Terri- 
tory, California, and Texas. 
Habitat: Grain and clover fields, waste places. 
Similar to the native plant, but has pinnatifid root-leaves, the 
stem-leaves are fewer and more slender, and the white petals of the 
flowers are very minute, sometimes entirely lacking. The rounded 
and notched pods have a minute wing-margin at the top, slightly 
more pronounced than in the preceding species. (Fig. 122.) 
Means of control the same as for Shepherd’s Purse. 
FIELD PEPPERGRASS 
Lepidium campéstre, R. Br. 
Other English names: Field Cress, Cow Cress, Poor Man’s Pepper, 
Yellow Seed, Mithridate Mustard. 
Introduced. Annual and winter annual. Propagates by seed. 
Time of bloom: April to July. 
Seed-time: Late May to August. 
Range: New Brunswick and Ontario to Michigan, southward to 
bh es and the Middle Western States; also on the Pacific 
oast. 
Holsioss Grain and clover fields, meadows, roadsides, and waste 
places. 
A weed whose range is rapidly widening, mostly by the agencies 
of impure grass and clover seed. Stem ten to eighteen inches tall, 
erect, branching at the top, gray-green with fine, downy hair. 
Root-leaves tufted, spatulate, two to four inches long, tapering to 
petioles; stem-leaves arrow-shaped, slightly toothed, sessile and 
clasping the stem with an auricled base; all leaves softly downy. 
Flowers white, the petals so small as to be hardly noticeable. 
Silicles ovate, rough, concave above, convex below, winged and 
notched at the tip, the style protruding from the notch. Seeds 
reddish yellow, very pungent to the taste. 
