water mint

from the GNU version of the Collaborative International Dictionary of English.

• A kind of mint (Mentha aquatica) growing in wet places, and sometimes having a perfume resembling bergamot.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A herb in mint family, Mentha aquatica.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a European mint that thrives in wet places; has a perfume like that of the bergamot orange; naturalized in eastern North America