What is "jostaberry"

n. A fruit made by crossing several members of the ''Ribes'' genus, including blackcurrant and gooseberry.

The jostaberry is a complex-cross fruit bush in the Ribes genus, involving three original species, the black currant R. nigrum, the North American coastal black gooseberry R. divaricatum, and the European gooseberry R. uva-crispa. It is similar to Ribes × culverwellii, the Jochelbeere, which is descended from just two of these species, R. nigrum and R. uva-crispa.