Table 1.
List of species in the questionnaire and the number of answers with relevant information
| Scientific name | Relative frequency in the country (1: common; 5: rare) | Known by name (nr) | Known but not called by name (nr) | Unknown (nr) |
|---|---|---|---|---|
| Phragmites australis (Cav.) Trin. ex Steud. | 1 | 70 | 2 | – |
| Nymphoides peltata (S.G.Gmel.) Kuntze | 3 | 1 | 31 | 40 |
| Nuphar lutea (L.) Sm. | 1 | 43 | 20 | 9 |
| Lemna trisulca L. | 2 | – | 14 | 58 |
| Lemna minor L. | 1 | 62 | 9 | 1 |
| Potamogeton nodosus Poir. | 2 | – | 41 | 31 |
| Stuckenia pectinata (L.) Börner | 2 | – | 30 | 42 |
| Hydrocharis morsus-ranae L. | 2 | 1 | 29 | 42 |
| Glyceria maxima (Hartm.) Holmb. | 1 | – | 38 | 34 |
| Sparganium emersum Rehmann | 3 | 1 | 11 | 60 |
| Sparganium erectum Rehmann | 1 | 1 | 11 | 60 |
| Trapa natans L. | 2 | 29 | 15 | 38 |
| Hippuris vulgaris L. | 5 | – | 7 | 65 |
| Ceratophyllum submersum L. | 3 | 1 | 6 | 65 |
| Ceratophyllum demersum L. | 2 | 1 | 62 | 9 |
| Juncus effusus L. | 1 | – | 35 | 37 |
| Juncus bufonius L. | 2 | – | 3 | 69 |
| Myriophyllum spicatum L. | 2 | 3 | 38 | 31 |
| Myriophyllum verticillatum L. | 3 | 3 | 36 | 33 |
| Iris pseudacorus L. | 1 | 33 | 28 | 11 |
| Nymphaea alba L. | 3 | 68 | 3 | 1 |
| Salvinia natans (L.) All. | 3 | 14 | 26 | 32 |
| Marsilea quadrifolia L. | 5 | – | 1 | 71 |
| Butomus umbellatus L. | 1 | 5 | 43 | 24 |