Aldrovanda vesiculosa L. (waterwheel plant, Droseraceae) is a rare and remarkable aquatic carnivorous plant with snapping traps living naturally on four continents of the Old World and introduced to North America (Breckpot 1997; Cross 2012; Fleischmann et al. 2018). Although Aldrovanda covers a huge territory within several climatic zones (temperate to tropical), it is highly scattered. A recent world-wide survey found only 50 sites, with the center of its distribution in Ukraine and Poland (Cross 2012; Adamec 2018). Aldrovanda is a monotypic genus without any subspecies, but its distant world populations usually differ in some physiological traits (turion formation, red coloration). However, in spite of these striking physical differences, the genetic differences between world populations (accessions) are surprisingly minimal (Adamec & Tichý 1997; Maldonado San Martín et al. 2003; Hoshi et al. 2006; Elansary et al. 2010; Cross 2012; Adamec 2018). Although the flowers are opened for only a few hours (Adamec & Tichý 1997; Cross 2012; Adamec 2018), under favorable conditions in all climatic zones, autogamous Aldrovanda can flower, self-pollinate, and set seed (Cross et al. 2016).