DISTRIBUTION OF TRAPA NATANS S.L. (LYTHRACEAE) IN ALTAI KRAI: HISTORICAL DATA AND NEW LOCATIONS
I.S. Chupina1, M.M. Silanteva1, N.Y. Kurepina2
1Altai State University, 61, Lenina av., Barnaul, 656049, Russia
2Institute for Water and Environmental Problems, SB RAS, 1, Molodezhnaya str., Barnaul, 656038, Russia
Keywords: Trapa natans, water caltrop, distribution, Altai krai, new locations
Abstract
Trapa natans L. s.l. is a relict species characterized by a cosmopolitan disjunctive range. The number of its populations is reducing throughout the range, and therefore it is included in many regional Red Books of the constituent entities of the Russian Federation. At the same time, there are fragments of the range where the species is invasive. The first reliable data on the distribution of the species in the territory of Altai accounted for the first third of the XIX century. Until the beginning of the XX century, only six water caltrop localities were known in the region, however, now 32 sites have already been found. In order to reconstruct the picture of the water caltrop distribution in the Altai Territory, herbarium collections and literary sources, photo materials and own fees were used. We compiled a map of the T. natans distribution in Altai krai, which reflects the historical data as well as the present new sites for the species discovered by the authors.
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