178 CRUCIFERAE (MUSTARD FAMILY) 



GREEN-FLOWERED PEPPERGRASS 



Lepldium apetalum, 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 

 Lepldium campestre, 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 



Virginia and the Middle Western States ; also on the Pacific 



Coast. 

 Habitat: 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. 



