mint

Boyd’s Bible Dictionary:

All aromatic herb, varieties numerous
(Matt. 23:23; Luke 11:42).

Concise Bible Dictionary:

One of the small herbs on which the Pharisees were careful to pay tithes (Matt. 23:23; Luke 11:42). There are several species of mint; the Mentha Sylvestris is common in Syria.
 
Mentha Sylvestris

Strong’s Dictionary of Greek Words:

Number:
2238 (find all occurrences in KJV Bible)
Greek:
ἡδύοσμον
Transliteration:
heduosmon
Phonic:
hay-doo’-os-mon
Meaning:
neuter of the compound of the same as 2234 and 3744; a sweet-scented plant, i.e. mint
KJV Usage:
mint