Sharp-leaved pond-weed Potamogeton acutifolius is a Red Data Book pondweed that is only found in a few localities in the UK in south-east England, and is very localised in the RX area. I found it at the weekend at Small Hythe. I have also seen it on The Dowels where it appeared in one ditch from seed after ditch clearance. This rare pondweed requires unpolluted fresh water, and much of the Marshes are probably too brackish for it.
The plant is a dark-green to reddish-brown grass-leaved pond-weed with characteristically sharply pointed leaves about 5mm wide, and flattened stems, - see above. If you examine the leaves under a hand-lens they have three veins running down the leaf (another slightly similar species has 5 veins). Read the rest of this entry »