Abstract:

Pollen morphologies of 36 different cultivated Tree Peony cultivars were observed under LM and SEM. Results showed： the pollen existed in the form of simple grain； with tricolporate and reticulate exine sculpture. However，pollen morphologies among different cultivar groups were different. The pollen morphologies of Japanese cultivars and the central plains cultivars were greatly different from that of the northwest cultivars，while the difference between Japanese cultivars and central plains cultivars was not obvious. Cluster analysis further testified that the genetic relationship between the central plains cultivars and Japanese cultivars was closer.

Key words: Tree Peony(<, i>, Paeonia suffruticosa<, /i>, ), cultivar group, pollen morphology