I just wanted to post this. These are from seeds that a colleague brought over from China and left the seeds with me. From the batch of seeds brought over, I got six to grow and these ones are 5-6 years old. I've had them in pots the entire time. Now that we finally have a place of our own, they will be planted in the ground. My colleague wasn't specific though on the species (bit of a communication barrier), but I believe they are Paeonia ostii.