Additions to the vascular flora of the Tyumen region, Western Siberia

The article contains information on five species and three hybrids (Potamogeton × acutus, Potamogeton × pseudolacunatus, Stuckenia chakassiensis × S. macrocarpa) of vascular plants new to the Tyumen Region; seven of them are hydrophyte and one is a semi-aquatic species. We provided the occurrence data on 37 plant species not previously known in examined administrative districts of the Tyumen region, including four protected (Cypripedium macranthos, Pedicularis dasystachys, Ranunculus silvisteppaceus, Zannichellia repens) and four alien species (Elodea canadensis, Galega orientalis, Impatiens glandulifera, Phragmites altissimus).