| black medick | (n) prostrate European herb with small yellow flowers and curved black pods; naturalized in North America, Syn. nonesuch clover, yellow trefoil, hop clover, Medicago lupulina |
| hop clover | (n) clover native to Ireland with yellowish flowers; often considered the true or original shamrock, Syn. shamrock, lesser yellow trefoil, Trifolium dubium |