To the study of gynodioecy in Thymus genera (Lamiaceae)

We studied the variations in phenological and daily terms of flowering and seed production of hermaphroditic and female forms of gynodioecic Thymus marschallianus Willd. (in nature populations of Troitsk forest-steppe reserve) and Th. dimorphus Klok. et Shost. (in collection site of the reserve). The female forms of both species had higher seed production than the hermaphroditic forms. The hermaphroditic and female forms varied in secondary sex characters. The last were more evident in optimal conditions of the studied species growing, and less evident in pessimal conditions.