Paeonia tenuifolia rubra flora plena or flore plena is the correct designation for the fern leaf double red. I just ordered one from Harvey Buchite who is one of the biggies in the American Peony Society, owner of the Hidden Springs Flower Farm. The fern leaf peonies do not multiply as fast as the common lactifloras so they are scarce and therefore expensive. My cost was $45, paid in advance, and $11.50 shipping. P.tenuifolia, the single red, is a bit cheaper. These are both species plants. I mentioned on another thread he has a P.tenuifolia rosea for $125.
