Potamogeton richardsonii (A.Benn.) Rydb. [ Potamogeton perfoliatus var. richardsonii A.Benn.]

Potamogeton richardsonii (A.Benn.) Rydb. [ Potamogeton perfoliatus var. richardsonii A.Benn.]

no HD illustration available (m3) — 58 832756 Potamogeton richardsonii (A.Benn.) Rydb. [107 832668 Potamogeton perfoliatus var. richardsonii A.Benn.] Potamogetonaceae
H.G.A. Engler, Pflanzenr., vol. 11 [Heft 31], (Potamogetonaceae): p. 93, fig. 21 H (1907)