medicago lupulina(n = noun.plant) black medick, hop clover, nonesuch clover, yellow trefoil - prostrate European herb with small yellow flowers and curved black pods; naturalized in North America;
is a kind of medic, medick, trefoil

genus medicago, medicago, medicago arborea, medicago echinus, medicago falcata, medicago intertexta, medicago sativa