Cardilia

From Memory Alpha, the free Star Trek reference

The cardilia was a variety of plant grown in the arboretum aboard the USS Enterprise-D.

In 2367, Keiko O'Brien was doing an isozyme study on some populations of cardilia but they turned out to have some really weird polymorphisms, which caused Keiko some headaches. (TNG: "Night Terrors")

In real life, cardilia are a variety of clam.