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Lori, Russian botanical sources describe P. sukaczevii (which is a synonym of P. tenuiloba) as violet-flowered. That's a puzzle. True. The genus is not clearly divided on species. Lots of synonyms and alternative systematics. The other problem is many species hybridize easily and if you've got seeds from somebody's garden you couldn't be ensured the species is true.
Well, I'm totally confused then. What is the plant that Mike and I have?