West Highland Flora

Shining Pondweed


Potamogeton lucens

 

Potamogeton lucens

Photo Carl Farmer
23 Sep 2001 Suardal, Skye

Rare in alkaline lochs

Leaves on main stem c 7-20 cm long.

ID: Leaves of only one kind, not separated into submerged and floating.  Leaves c 3-6 x as long as wide, with a short point, or extension of the midrib, at tip.  In the axil of each leaf is a stiff, pale green, yellowish or reddish stipule, about 40% as long as the leaf, with two conspicuous ribs or keels.  All leaves have a short stalk about 1-12 mm long, with the blade of the leaf often decurrent onto the stalk so that it's hard to say where the stalk ends.

Other features: Leaves wavy-edged.  On either side of the midrib there are about 2 prominent veins and outside those another 2 or so fainter ones.  Joining these lengthwise veins there are thinner but still very conspicuous cross-veins, which are at an angle of about 60-80 to the main veins, both near the midrib and near the edge (in many pondweeds, they are almost horizontal near the edge but strongly ascending near the middle).   Fruit-spike thickening upwards.

 

Potamogeton lucens

Photo Carl Farmer
23 Sep 2001 Suardal, Skye

 

Potamogeton lucens

Photo Carl Farmer
23 Sep 2001 Suardal, Skye

 

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