Despite the frequent occurrence of hybridization events between broad-leaved members of the genus Potamogeton, few documented reports and descriptions of these taxa are found in North American pondweed literature. Potamogeton crispus and P. praelongus are common broad-leaved pondweed species with overlapping distributions in North America, yet no confirmed report of their hybrid, P. × undulatus, has been previously documented from this continent. We provide the first confirmed report of P. × undulatus in North America, where it was collected from a northeastern Indiana lake. Because most descriptions of P. × undulatus are found in somewhat less accessible nineteenth century European pondweed literature, morphological characters that are diagnostically valuable in distinguishing the hybrid from its parents are discussed and illustrated. A vegetative key to this hybrid and its parental species is also provided.
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1 December 2006
First report of Potamogeton × undulatus (P. crispus × P. praelongus, Potamogetonaceae) in North America, with notes on morphology and stem anatomy
Mitchell S. Alix,
Robin W. Scribailo
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Rhodora
Vol. 108 • No. 936
December 2006
Vol. 108 • No. 936
December 2006
hybridization
North America
P. crispus
P. praelongus
Potamogeton × undulatus