Spirodela polyrhiza (L.) Schleid.
no HD illustration available (m1)
Spirodela polyrhiza (L.) Schleid. [ Lemna polyrrhiza L.] [Lemnaceae]
V.L. Komarov (Komorov), Fl. URSS, vol. 3 : p. 486, t. 26, fig. 6 (1934-1964)