EED SET OF OENANTHE AQUATICA (APIACEAE) IN MOSCOW REGION
Vladimir N. Godin1, Tatyana V. Arkhipova2, Violetta Z. Yusufova2
1Central Siberian Botanical Garden, SB RAS, Novosibirsk, Russia
2Moscow Pedagogical State University, Moscow, Russia
Keywords: Oenanthe aquatica, Apiaceae, seed set
Abstract
We studied the seed set of the andromonoecious Oenanthe aquatica (Fine-leaved Water-Dropwort), a biennial or perennial mono- or oligocarpic herbaceous plant. Our survey was carried out in natural conditions of the Moscow region in 2021 according to generally accepted methods of studying plant seed sets. We showed that the seed set of individuals depends on the degree of synflorescences branching. Fine-leaved Water-Dropwort has two types of individuals with umbels on shoots of I-III and I-IV orders. O. aquatica has a high potential (number of ovules per individuals) and real (number of seeds per individuals) seed set (up to 21 490 seeds per individual) and the proportion of perfect flowers forming full seeds (95.8-96.8 % per individual). The potential and real seed set of terminal umbels is lower than that of individual umbels on shoots of the second orders. In Fine-leaved Water-Dropwort, the seed set of umbels on shoots of the same branching order naturally increases with an increase in the branching of the shoot system. The contribution of the seed set of umbels to the total seed set of O. aquatica individuals also depends on the degree of synflorescences branching. With an increase in the branching of the shoot system, the share of seed set of terminal umbels and umbels on second-order shoots gradually decreases. These characteristics of umbels on third-order shoots naturally increase due to both their numerical predominance.
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