Na·tal plum
  1. Bot. The drupaceous fruit of two South African shrubs of the genus Carissa (formerly Arduina) (Carissa bispinosa and Carissa grandiflora).  It is also called amatungulu.
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  Carissa grandiflora
       n : very large closely branched South African shrub having
           forked bright green spines and shiny leaves [syn: natal
           plum, amatungulu, Carissa macrocarpa]