Definition of "sweetleaf"

Any plant of the genus Stevia, from which stevia is extracted.  examples

Sauropus androgynus, a plant of the family Phyllanthaceae whose leaves may be used as a potherb.  examples

Symplocos tinctoria, an evergreen shrub or small tree in the southeastern United States.  examples

Monarda fistulosa, wild bergamot, a medicinal and ornamental herb.  examples

(slang) Cannabis.