LEGUMINOS^ 



4SI 



(Fig. 189) are in long clusters, twisted into three to five 

 spirals, and the edges bear numerous grooved spines which 

 interlock. The seeds are kidney-shaped, and about 2}^'^ milli- 

 meters long. Medicago arabica inermis is a spineless-podded 

 form.. 



Fu;. 190. — Toothed bur clover (Medicago hispida). 



Spotted bur clover is a native of Europe and Western 

 Asia. It is introduced into the United States and occurs on 

 the Atlantic, Gulf, and California coasts. It is being used 

 as a pasturage crop. 



