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Keys
Vascular plant groups
Club mosses
Ferns
Vegetative key to families
Gymnosperms
Flowering plants
Genera
Families
Potamogeton L.
Inflorescence
usually more than 2-flowered. Carpels 4. Mature fruit ±
sessile
Potamogeton
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Leaves distinctly
petiolate
; the upper ones with a floating
lamina
; a few of the lower ones submerged and of a different shape
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Leaves
sessile
or nearly so, all alike, submerged,
membranous