We received this as P. verticillatum but were corrected it was P. stewartianum, which apparently isn't either, but no one is able to ID if for sure. Let's just enjoy the plant for what, or for whatever it is! The leaves are arranged in whorls, from their axils pinkish-cream flowers are dangling. Very unique, adding a different texture to the shade garden. Likes a moist soil. May be shipped as bare root devisions.