Paeonias fall into two main categories. Paeonia lactiflora - common herbaceous garden Paeonia, while Paeonia suffruticosa - tree peonies are woody perennials.
Both of the above Paeonia Trees were grafted on to the herbaceous lactiflora. Because H did not bury the lemon one deep enough the original lactiflora grows too. This we should really remove at ground level, but we love it's flowers, and the lemon plant is unaffected by it.
The original herbaceous Paeonia lactiflora
Paeonia Delavayi and Paeonia ludlowii are native to China. The peony is amongst the longest used flowers in Oriental culture and is one of the national emblems in China. Mischievous nymphs were said to hide in the petals of the peony, giving it the meaning of shame or bashfulness in the language of flowers.