Potamogeton praelongus, commonly known as whitestem pondweed in North America and long-stalked pondweed in Britain, is a large, perennial aquatic plant...

P. praelongus (P. × undulatus Wolgf.), P. ochreatus (P. × jacobsii Z.Kaplan, Fehrer & Hellq.) and P. friesii (P. × lintonii Fryer). Potamogeton crispus...

P. alpinus, P. praelongus), but a few species are diploid (e.g. P. coloratus or octaploid (2n = 104; e.g. P. illinoensis). Potamogeton is a genus of freshwater...

Potamogeton × griffithii is a hybrid pondweed between Potamogeton alpinus and Potamogeton praelongus. It occurs in oligotrophic, moderate alkalinity lakes...

Potamogeton perfoliatus (claspingleaf pondweed, perfoliate pondweed, redhead grass) is a perennial aquatic plant in the family Potamogetonaceae occurring...

and P. praelongus (P. × griffithii A. Benn.). All are rather rare, but where they do occur they may be locally abundant and long-lived. Potamogeton alpinus...

Potamogeton natans (N) Potamogeton nodosus (N) Potamogeton perfoliatus (N) Potamogeton praelongus (N) Potamogeton pulcher (N) Potamogeton pusillus ssp. pusillus...

native, endemic Potamogeton natans – native Potamogeton perfoliatus ssp. perfoliatus – native Potamogeton praelongus – native Stuckenia filiformis ssp. alpina...

Potamogeton lucens, or shining pondweed, is an aquatic perennial plant native to Eurasia and North Africa. It grows in relatively deep, still or slow-flowing...

poplar endangered endangered plants Potamogeton praelongus White-stemmed pondweed endangered endangered plants Potamogeton pulcher Spotted pondweed endangered...