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Leonurus cardiaca (Lamiaceae) is an important medicinal plant, growing wildly in many parts of Iran. It has been used to cure cardiovascular diseases, stress, anxiety, and nervous irritability. There has been no report on the breeding system of this species. This experiment was accordingly conducted to investigate the flower biology, pollination system, pollinators, and breeding system. The results show protandry is the dominant form, and the stigma reaches its most receptivity 48 hours afterdoi:10.5281/zenodo.2558437 fatcat:k4uoehimt5gsvdyksbyoaqrbqy