found: Web. 3(peppermint (Mentha piperita))
found: Biol. & agr. index(Peppermint)
found: Usher dict. plants(Mentha piperita)
found: ITIS, Apr. 30, 2000(Mentha X piperita. Common name: peppermint. Synonyms: Mentha aquatica var. crispa, Mentha crispa, Mentha dumetorum)
found: PLANTS database, via WWW, Apr. 30, 2000(Mentha x piperita, peppermint. Synonyms: Mentha aquatica var. crispa, Mentha crispa, Mentha dumetorum)
found: GRIN taxonomy, via WWW, Apr. 30, 2000(Mentha x piperita L. nothosubsp. piperita. Comments: =M. aquatica x M. spicata subsp. spicata. Common name: peppermint; Mentha x piperita, =M. aquatica x M. spicata)