Typha angustata Bory & Chaub. (Typha L., Typhaceae) in the Delta of the Don River (Rostov Oblast)

This article provides information on the finding of the narrowleaf cattail Typha angustata in the delta of the Don River. In the monography “Flora of the Soviet Union,” this species was understood quite broadly; its range stretched from the Danube River to the Pacific Ocean. It had not been found for a long time, so the species was referred to as synonymous to T. australis, T. domingensis, and T. angustifolia. Modern studies have revealed the presence of the species in the distributaries of the Don River. Due to isolations in the Cenozoic, resulting in the severance of the connections with the eastern and western water basins, the range was significantly reduced and the rate of evolution decreased. In the modern geological period, T. angustata is undergoing natural and technogenic elimination.