Deer's Tongue is a North American herb also called by the botanical name of Trilisa ordoratissima
In HooDoo it's magical properties are:
Planetary Association : Mars
Elemental Association : Fire
Gender : Masculine
Powers: Lust, Psychic Powers Stops gossip
Magickal Uses : Love, psychic powers. Used to get someone to love you, to obtain a proposal of marriage, also for court cases. Deers tongue is used when working with the brow chakra to project mind energy. It can awaken psychic gifts of an expressive nature. When worn by women, deers tongue is said to be attractive to men.
You can purchase the herb at http://herb-magic.com/deers-tongue.html
Or you could substitute another herb that has similar magical properties such as Ginger if you're looking to heat up a love affair or relationship.