Fries' Pondweed (Potamogeton friesii)
Description
Flat-stalked pondweed grows annually from turions and seed, producing branching plants with slender, flattened stems that are well-branched. The submerged leaves are long, rather grass-like, sessile, and translucent. The leaf tips are mucronate (i.e. with the midrib extending out of the leaf, giving a pointed appearance). Abundant turions are produced along the stem, especially in autumn as the plant disintegrates.Flat-stalked pondweed could be confused with other fine-leaved pondweeds within its range, especially Potamogeton obtusifolius but potentially also P. pusillus. The combination of open stipules, rounded tips to the leaves, dense flower spikes and a tendency to produce a mass of bushy growth at the surface all help to distinguish this plant, but use of a botanical key or flora is recommended.Potamogeton friesii is diploid, with 2n=26.
Taxonomic tree
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Domain: Eukarya
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Kingdom: Plantae
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Phylum: Magnoliophyta
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Class: Liliopsida
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Order: Alismatales
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Family: Potamogetonaceae
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Genus: Potamogeton
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