The Collaborative International Dictionary of English v.0.48:

Coca \Co"ca\, n. [Sp., fr. native name.]
   The dried leaf of a South American shrub (Erythroxylon
   Coca). In med., called Erythroxylon.
   [1913 Webster]

   Note: Coca leaves resemble tea leaves in size, shape, and
         odor, and are chewed (with an alkali) by natives of
         Peru and Bolivia to impart vigor in prolonged exertion,
         or to sustain strength in absence of food.
         [1913 Webster]

   Mexican coca, an American herb (Richardsonia scabra),
      yielding a nutritious fodder. Its roots are used as a
      substitute for ipecacuanha.
      [1913 Webster]