| Elatinaceae | |
Elatine hydropiper subsp. campylosperma
| P. Fourn. | Quatre Fl. France 442 | 1936 |
| Elatinaceae | |
Elatine hydropiper subsp. gyrosperma
| Fr. | Novit. Fl. Suec. Mant. 187 | 1842 |
| Elatinaceae | |
Elatine hydropiper var. gyrosperma
| (Fr.) Lange | Haandb. Danske Fl. 245 | 1850 |
| Elatinaceae | |
Elatine hydropiper fo. intermedia
| Seub. | Nov. Actorum Acad. Caes. Leop.-Carol. Nat. Cur. 21: 47 | 1845 |
| Elatinaceae | |
Elatine hydropiper fo. orthosperma
| (Düben) Saelán, Kihlm. & Hjelt | Herb. Mus. Fenn. ed. 2, 1: 64, 135 | 1889 |
| Elatinaceae | |
Elatine hydropiper subsp. orthosperma
| F. Herm. | | |
| Elatinaceae | |
Elatine hydropiper subsp. orthosperma
| (Düben) Fr. | Novit. Fl. Suec. Mant. 187 | 1842 |
| Elatinaceae | |
Elatine hydropiper var. orthosperma
| (Düben) Hartm. | Handb. Skand. Fl. ed. 4: 126 | 1843 |
| Elatinaceae | |
Elatine hydropiper fo. submersa
| Seub. | Nov. Actorum Acad. Caes. Leop.-Carol. Nat. Cur. 21: 47 | 1845 |
| Elatinaceae | |
Elatine hydropiper fo. terrestris
| Seub. | Nov. Actorum Acad. Caes. Leop.-Carol. Nat. Cur. 21: 47 | 1845 |
| Elatinaceae | |
Elatine hydropiper var. triandra
| (Schkuhr) Fiori | Nuov. Fl. Italia 1: 518 | 1924 |