Flowering biology of Origanum vulgare L. (Lamiaceae) in Moscow region

The structure of synflorescences, the flowering of the main-florescences, co-florescences and partial florescences, as well as the perfect and pistillate flowers of Origanum vulgare L. (Lamiaceae) have been studied. Observations were conducted in 2015-2018 according to generally accepted methods in Moscow region. Synflorescence O. vulgare is a frondose-bracteate umbel-like panicle consisting of florale units are racemose thyrsus. The perfect flowers of O. vulgare are strictly protandrous, the duration of their flowering is 2-3 days. In the pistillate flowers, the staminate stage is absent, they function 1.5-2 days. In racemose thyrsus the opening of flowers occurs acropeately, the duration of their flowering depends on the number of flowers on them. Blooming of the floral units within the main axis and paraclades, as well as the paraclades in the synflorescence occurs in the basipetal order.