PEA AND BEAN TRIBE. 



149 



ON(5Nis ARVENSIS (Common Rest-harrow). 



5. MEDICAGO (Medick). 



1. M. lupulina (Black Medick, or Nonsuch). Leaf- 

 lets inversely egg-shaped, finely toothed ; stipules scarcely 

 notched ; flowers in dense oblong heads ; legumes rugged, 

 1 -seeded, kidney-shaped. In pastures, common. A her- 

 baceous plant, with the habit of some of the smaller 

 Clovers, from which it may be distinguished by its 

 legumes not being enclosed within the calyx. Flowers 

 yellow; legumes black, not spirally curved. M. June 

 August. Annual. 



2. M. maculdta (Spotted Medick). Leaflets inversely 

 heart-shaped ; stipules toothed ; flowers 2 4 together ; 

 legumes spirally twisted into a prickly ball ; prickles 

 curved. In the south and west of England, not uncom- 



