22 WEEDS OF FARM LAND 



narrow wing is developed, but this is so small in proportion 



A 



D 



FIG. 7. WINGED SEEDS AND FRUITS. 



A. Winged Seed of Yellow Rattle (Rhinanthns crista-galli). 



B. Winged Seed of Spurry (Spergula arvensis). 



C. Winged Fruit of Hogweed (Heracleum Sphondylium}. Wing developed from 



Fruit Coat. 



D. Winged Fruit of Broad-leaved Dock (Rumex obtusifolius). Wing consists of 



persistent Perianth. 



(The small sketches are natural size.) 



to the size of the seed that it is doubtful if it is an effective 

 agent in distribution. 



