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Fam.: Potamogetonaceae / Pontweed Fam.      

Genus:  Potamogeton  L.
 

Authors:
   WULFEN:  Franz Xaver Freiherr von Wulfen (1728 - 1805), jesuit and naturalist in the Austrian-Ungarian dual monarchy
   L.:  Carl von Linné (Linnaeus, 1707 - 1777), Swedish naturalist who introduced the binary naming system for plants and animals
 

Etymology:
   Potamogeton:   potamos = river, geiton = neighbor
   praelongus:   very long (leaves)
 

As the frequent Potamogeton perfoliatus also the rare Potamogeton praelongus has only subaequeous leaves, but no swimming leaves. At both species only the flowers are protruding outside the water. Potamogeton praelongus grows in 1,5 to 4 meter deep water. The long and rarely branched stems have a whitish color, and the onset of the leaves is stem-clasping. Sometimes teared stems are washed up to the lakeshore, as shown here.

 

Potamogeton praelongus / Long-Stalked Pontweed, Whitestem Pontweed, D Kisslegg-Waltershofen 12.7.2021
Fig. 1:  Potamogeton praelongus / Long-Stalked Pontweed, Whitestem Pontweed
D Kisslegg-Waltershofen 12.7.2021
Potamogeton praelongus / Long-Stalked Pontweed, Whitestem Pontweed, D Kisslegg-Waltershofen 12.7.2021
Fig. 2:  Potamogeton praelongus / Long-Stalked Pontweed, Whitestem Pontweed
D Kisslegg-Waltershofen 12.7.2021
Potamogeton praelongus / Long-Stalked Pontweed, Whitestem Pontweed, D Kisslegg-Waltershofen 12.7.2021
Fig. 3:  Potamogeton praelongus / Long-Stalked Pontweed, Whitestem Pontweed
D Kisslegg-Waltershofen 12.7.2021
Potamogeton praelongus / Long-Stalked Pontweed, Whitestem Pontweed, D Kisslegg-Waltershofen 12.7.2021
Fig. 4:  Potamogeton praelongus / Long-Stalked Pontweed, Whitestem Pontweed
D Kisslegg-Waltershofen 12.7.2021
Potamogeton praelongus / Long-Stalked Pontweed, Whitestem Pontweed, D Kisslegg-Waltershofen 12.7.2021
Fig. 5:  Potamogeton praelongus / Long-Stalked Pontweed, Whitestem Pontweed
D Kisslegg-Waltershofen 12.7.2021
Potamogeton praelongus / Long-Stalked Pontweed, Whitestem Pontweed, D Kisslegg-Waltershofen 12.7.2021
Fig. 6:  Potamogeton praelongus / Long-Stalked Pontweed, Whitestem Pontweed
D Kisslegg-Waltershofen 12.7.2021
Potamogeton praelongus / Long-Stalked Pontweed, Whitestem Pontweed, D Kisslegg-Waltershofen 12.7.2021
Fig. 7:  Potamogeton praelongus / Long-Stalked Pontweed, Whitestem Pontweed
D Kisslegg-Waltershofen 12.7.2021
Potamogeton praelongus / Long-Stalked Pontweed, Whitestem Pontweed, D Kisslegg-Waltershofen 12.7.2021
Fig. 8:  Potamogeton praelongus / Long-Stalked Pontweed, Whitestem Pontweed
D Kisslegg-Waltershofen 12.7.2021
Potamogeton praelongus / Long-Stalked Pontweed, Whitestem Pontweed, D Kisslegg-Waltershofen 12.7.2021
Fig. 9:  Potamogeton praelongus / Long-Stalked Pontweed, Whitestem Pontweed
D Kisslegg-Waltershofen 12.7.2021
Potamogeton praelongus / Long-Stalked Pontweed, Whitestem Pontweed, D Kisslegg-Waltershofen 12.7.2021
Fig. 10:  Potamogeton praelongus / Long-Stalked Pontweed, Whitestem Pontweed
D Kisslegg-Waltershofen 12.7.2021
Potamogeton praelongus / Long-Stalked Pontweed, Whitestem Pontweed, D Kisslegg-Waltershofen 12.7.2021
Fig. 11:  Potamogeton praelongus / Long-Stalked Pontweed, Whitestem Pontweed
D Kisslegg-Waltershofen 12.7.2021

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