[1] : The Collaborative International Dictionary of English v.0.48

mentha \men"tha\, n. l. see mint the plant. bot.
   a widely distributed genus of fragrant herbs, including the
   peppermint, spearmint, etc. the plants have small flowers,
   usually arranged in dense axillary clusters.
   1913 webster
see also:
mint 

[2] : WordNet (r) 2.0

mentha
     n : mint plants syn: genus mentha
see also:
genus mentha 

Mentha >> M Words
Mentha, definition of term: Mentha
mentha_pag1.html

Mentha Spicata >> M Words
Mentha Spicata, definition of term: Mentha Spicata
mentha+spicata_pag1.html

Mentha Piperita >> M Words
Mentha Piperita, definition of term: Mentha Piperita
mentha+piperita_pag1.html