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Fam.: Potamogetonaceae / Pontweed Fam.      
 

Hybrid formula (parents):  Potamogeton gramineus  L.  x  Potamogeton lucens  L.
Synon.:  Potamogeton x zizii  ROTH,  Potamogeton illinoensis  MORONG
 

Genus:  Potamogeton  L.
 

Authors:
   J.PRESL:  Jan Svatopluk Presl (1791 - 1849), Bohemian botanist
   L.:  Carl von Linné (Linnaeus, 1707 - 1777), Swedish naturalist who introduced the binary naming system for plants and animals
   ROTH:  Albrecht Wilhelm Roth (1757 - 1834), physician and botanist from Bremen (Northern Germany)
   MORONG:  Thomas Morong (1827 - 1894), botanist in USA
 

Etymology:
   Potamogeton:   potamos = river, geiton = neighbor
   angustifolius:   narrow-leaved
   gramineus:   grass-like
   lucens:   shining
   zizii:   Johann Baptist Ziz (1779 - 1829), German botanist (ZIZ)
   illinoensis:   from Illinois (USA)
 

Potamogeton x angustifolius has rarely swimming leaves, often the whole plant is growing under water. Up to now I saw only teared pieces of the plant, which I found at the bank of the Rhine port at Karlsruhe, Southern Germany.

 

Potamogeton x angustifolius / Illinois Pontweed, D Karlsruhe 29.8.2009
Fig. 1:  Potamogeton x angustifolius / Illinois Pontweed
D Karlsruhe 29.8.2009
Potamogeton x angustifolius / Illinois Pontweed, D Karlsruhe 29.8.2009
Fig. 2:  Potamogeton x angustifolius / Illinois Pontweed
D Karlsruhe 29.8.2009
Potamogeton x angustifolius / Illinois Pontweed, D Karlsruhe 29.8.2009
Fig. 3:  Potamogeton x angustifolius / Illinois Pontweed
D Karlsruhe 29.8.2009
Potamogeton x angustifolius / Illinois Pontweed, D Karlsruhe 29.8.2009
Fig. 4:  Potamogeton x angustifolius / Illinois Pontweed
D Karlsruhe 29.8.2009
Potamogeton x angustifolius / Illinois Pontweed, D Karlsruhe 29.8.2009
Fig. 5:  Potamogeton x angustifolius / Illinois Pontweed
D Karlsruhe 29.8.2009
Potamogeton x angustifolius / Illinois Pontweed, D Karlsruhe 29.8.2009
Fig. 6:  Potamogeton x angustifolius / Illinois Pontweed
D Karlsruhe 29.8.2009
Potamogeton x angustifolius / Illinois Pontweed, D Karlsruhe 29.8.2009
Fig. 7:  Potamogeton x angustifolius / Illinois Pontweed
D Karlsruhe 29.8.2009
Potamogeton x angustifolius / Illinois Pontweed, D Karlsruhe 24.7.2010
Fig. 8:  Potamogeton x angustifolius / Illinois Pontweed
D Karlsruhe 24.7.2010
Potamogeton x angustifolius / Illinois Pontweed, D Karlsruhe 24.7.2010
Fig. 9:  Potamogeton x angustifolius / Illinois Pontweed
D Karlsruhe 24.7.2010
Potamogeton x angustifolius / Illinois Pontweed, D Karlsruhe 24.7.2010
Fig. 10:  Potamogeton x angustifolius / Illinois Pontweed
D Karlsruhe 24.7.2010
Potamogeton x angustifolius / Illinois Pontweed, D Karlsruhe 24.7.2010
Fig. 11:  Potamogeton x angustifolius / Illinois Pontweed
D Karlsruhe 24.7.2010
 
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