Abstract
Because the name Potamogeton ×babingtonii has been synonymised with P. ×angustifolius, no valid binominal exists for the hybrid P. lucens×praelongus. A morphological and anatomical study presented here demonstrates that specimens regarded by Hagström as Potamogeton ×babingtonii f. danicus really represent the hybrid between P. lucens and P. praelongus. As a consequence, a new binominal for this hybrid is introduced and its basionym Potamogeton ×babingtonii f. danicus is lectotypified. Morphological and anatomical characters of Potamogeton ×jutlandicus nom. nov. (=P. lucens×praelongus) are provided and its taxonomic delimitation is discussed.
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