Abstract
Hereby it was recognized that the flower of Japanese mint is of essential entomophilae and autonogamy. The seed setting percentage was considerably high when fertilized during two days (red-stem) or four days (green-stem) after flowering in the case of ovary, while the stamens were available merely for one day. The inflorescence treated with 50°C even for one hour reduced the seed setting percentage, and the damage due to high temperature was most seriously observed at the time of anthesis.
