Within the genus Streptocarpus the rosulate species comprising the rexii aggregate sensu Hilliard & Burtt (1971) include S. rexii (Hook.) Lindl., S primulifolius Gandoger, S. cyaneus S. Moore and S. parviflorus Hook. f. A new species recently discovered in the eastern Transvaal is included within the aggregate. In addition S. caeruleus subsp. logniflorus is raised to specific status.
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