One of the mysteries of the English language finally explained.
A Tasmanian shrub or small tree, Cenarrhenes nitida (family Proteaceae), that bears large purple fleshy fruit.
Mid 19th century; earliest use found in John Lindley (1799–1865), botanist and horticulturist. From Port Arthur, the name of an inlet in Tasmania (the site of a former penal colony) + plum.
Port Arthur plum/pɔːt ˌɑːθə ˈplʌm/
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