Sentence:  Cultivated <WSD>redcurrants</WSD> are most closely related to "Ribes rubrum", which like blackcurrants grow in northern Europe and northern Asia, although several other species have had a hand in the development of particular varieties; whitecurrants, for their part, are simply <WSD>redcurrants</WSD> with albino genes. Despite their similarities, the histories of blackcurrants and <WSD>redcurrants</WSD> in Britain are surprisingly distinct. 
Meaning of the word marked with <WSD> tags:  A deciduous shrub, "Ribes rubrum", native to western Europe; any of certain cultivars of the shrub.