Natal plum : The drupaceous fruit of two South African shrubs of the genus Arduina (A. bispinosa and A. grandiflora).

Example:


Taxonomy
Natal plum, cultivars, Floridata, Carissa macrocarpa, plant, dwarf, Apocynaceae, hedge, flowers and fruit, ground covers, Local Guides, dogbane Family, spines, branches, plum, thornless, salt spray, fruits.

Defination from the web:
Natal plum produces an abundance of white starlike flowers with five thick and waxy petals. ... Natal plum is tolerant of salty soil as well as salt spray and is therefore an excellent plant for the seaside garden, even in exposed conditions. ...