Morphological and Ecological Cenotic Features of the Relict Species Sparganium gramineum Georgi (Typhaceae) in Waterbodies of European Russia

The morphology of the vegetative and generative sphere of the relic species Sparganium gramineum Georgi, collected from lakes of the central region of European Russia (Moscow, Tver, and Yaroslavl oblasts) in 2014–2016, is considered. It is shown that, in regards to its life form, S. gramineum is a vegetatively mobile, clearly polycentric, long-rhizomed, and short-lived plant, a polycarpic with a racemose root system. This bur-reed species has been defined as a nonabundant and uncommon, typically freshwater, stenobiotic plant found in the coastal zone of mesotrophic (rarely oligotrophic) waterbodies. In the waterbodies under study, it forms both pure plant communities and groups with aquatic mixed grasses.