Prostrate European herb with small yellow flowers and curved black pods; naturalized in North America.

synonyms: black medick, Medicago lupulina, nonesuch clover, yellow trefoil.

Polish: lucerna nerkowata

Clover native to Ireland with yellowish flowers; often considered the true or original shamrock.

synonyms: lesser yellow trefoil, shamrock, Trifolium dubium.

Polish: koniczyna drobnogłówkowa