West Highland Flora

Bog Pondweed


Potamogeton polygonifolius

 

Potamogeton polygonifolius

Photo Carl Farmer
25 Aug 2002 Scorrybreac, Skye

Common in ditches, bogs and edges of lochs

Fruit spike 1-4 cm.  Floating leaves, blade 2-6 x 1-4 cm.

ID: Both floating and submerged leaves stalked.  Leaf-stalks typically much longer than leaf-blades; leaf not "jointed" (see Jointed Pondweed)

Other features: By far the commonest pondweed outside lochs, and in lochs it is one of the two commonest, the other being Jointed Pondweed.  Leaves very variable, see pictures below.  Stalk of fruit-spike does not widen towards the spike.  Fruit densely packed.

 

Potamogeton polygonifolius

Photo Carl Farmer
25 Aug 2002 Scorrybreac, Skye
 

Narrower leaves, in deep but tiny pool.

 

Potamogeton polygonifolius

Photo Carl Farmer
12 Sep 2002 Portree, Skye

 
Very narrow leaves, in deep water of a loch

 

Potamogeton polygonifolius

Photo Carl Farmer
2 Jul 2003 River Snizort, Skye

Plant with spike.  The flowers consist of 4 green sepals with no petals, enclosing 4 pink carpels.  (The green shoot next to the fruit is not part of this plant or species)

  Potamogeton polygonifolius

Photo Carl Farmer
2 Jul 2003 River Snizort, Skye
Spike 16 mm long

 


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