Red rubin basil (Ocimum basilicum 'Purpurascens') is an improved variety of Dark opal basil. Like many culinary basils, it is a cultivar of Ocimum basilicum (sweet basil).
Red ruby basil (Ocimum basilicum 'Purpurascens') is an enhanced type of Dark opal basil. Like many culinary basils, it is a subspecies of Ocimum basilicum (sweet basil).