Elfroot

Elfroot was first used by the elves of Arlathan, hence the name. The root gave their medicines particular efficacy, so when the Imperium conquered the elves, the magisters adopted its use and its popularity spread to all corners of the empire. Elfroot is a hardy plant with large green leaves that grows wild in many places. It's so common that it tends to show up in most gardens and fields, almost like a weed. Unlike a weed, however, most people appreciate having access to the wonderful little plant. The roots can be used with very little preparation. Rubbing some of the juice on a wound, for example, will speed up healing and numb pain. And chewing on a slice of root treats minor ailments like indigestion, flatulence, and hoarse throats.
There are several varieties, but the most useful for herbalists are the Bitter, Gossamer, and Royal Elfroots.
—An excerpt from The Botanical Compendium by Ines Arancia, botanist

Elfroot is the common name for canavaris; the herb actually has little to do with elves other than being commonly collected and traded to outsiders by the more nomadic tribes. It is the primary ingredient in many healing salves. Elfroot's medicinal properties have been widely researched, and it is a common herb to be found on many an apothecary shelf as well as home kits for first aid. 
Elfroot's recreational uses were discovered in 420 DR, and it is largely gathered to be used in pipeweed along with regular tobacco plants, to heighten the experience. Often people describe the plant to have a mellowing effect on them, which leads it to be hugely popular among adventurers seeking easy ways to relieve stress.

Environments: temperate climate preferred, survives almost anywhere Value: 1gp per pound

Scientific Name

canavaris eladrin

Conservation Status

common around temperate areas of Faerûn. Less common further up north, but it is a hardy plant that survives snowfall.