I always thought it was a mix, after the fact- not a crossbreed

The boysenberry /ˈbɔɪzənbɛri/ is a crossamong the European Raspberry (Rubus idaeus), a European blackberry (Rubus fruticosus), an American dewberry (Rubus aboriginum) and the Loganberry (Rubus × loganobaccus).[2]

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