Water fern (Salvinia oblongifolia), cultivated at the Botanical Garden (Botanicheskiy Sad) in St Petersburg, Russia. Photographed on 12 September 2005.A native of Brazil.www.inaturalist.org/observations/54029551
2010.07.28 Vienna II. district (bayou in Vienna Prater - Mauthnerwasser 156 m).Species introduced in the habitat by (most likely) fishkeepers who disposed of their aquarium and its content there.German name: Gewhnlich-SchwimmfarmID: Fischer & al., Exkursionsflora A/FL/SdT (2008 3rd), who also mention the very same habitat where, it seems, this species is able to sustain itself
Summary[edit] Description: English: Plate of Salvinia species from "Flora Brasiliensis" vol.1 pt.2. Date: 1840. Source: http://www.botanicus.org/item/31753002771142#. Author: Carl Friedrich Philipp von Martius (1794-1868).
Summary[edit] Description: English: Salvinia natans (sporocarps) in Police near Szczecin, NW Poland. Date: 15 October 2019, 12:46:38. Source: Own work. Author: Krzysztof Ziarnek, Kenraiz.
Summary[edit] Description: English: Salvinia minima in Wrocław University Botanical Garden. Date: 20 October 2016, 14:27:23. Source: Own work. Author: Krzysztof Ziarnek, Kenraiz.
Water fern (Salvinia oblongifolia) with magnifying water drop, cultivated at the Botanical Garden (Botanicheskiy Sad) in St Petersburg, Russia. Photographed on 12 September 2005.A native of Brazil.www.inaturalist.org/observations/54029551
2010.07.28 Vienna II. district (bayou in Vienna Prater - Mauthnerwasser 156 m).Put on a twig to shoot leaves and roots: note that not two leaves are paired on stems (as it seems) but three: two ordinary ones (swimming leaves), and a third one which remains submersed and looks like it were a root.German name: Gewhnlich-SchwimmfarmID: Fischer & al., Exkursionsflora A/FL/SdT (2008 3rd); see also comments here