Note:

Corn mint is Mentha arvensis.

Horsemint is M. sylvestris, and in the United States Monarda punctata, which differs from the true mints in several respects.

Mountain mint is any species of the related genus Pycnanthemum, common in North America.

Peppermint is M. piperita.

Spearmint is M. viridis.

Water mint is M. aquatica.

Mint camphor. (Chem.) See Menthol.

Mint julep. See Julep.

Mint sauce, a sauce flavored with spearmint, for meats.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Spearmint \Spear"mint`\, n. [So named from its spiry, not capitate, inflorescence. --Dr. Prior.]

(Bot.) A species of mint (Mentha viridis) growing in moist soil. It vields an aromatic oil. See Mint, and Mentha.

Source: Webster's Revised Unabridged Dictionary (1913)