Elodea nuttallii (Planch.) H. St. John A cf.
Annotated by Alan R. Batten, 13 Sep 2011. Remarks: based on DNA analysis by Donald Les (CONN) of other specimens of the same population; Former nature_of_id: molecular data.

Alaska: Chena Slough (aka Badger Slough) immediately upstream from Nordale Road bridge. Elev. 140-155
64.813733° N, 147.411383° W,
Datum: North American Datum 1983. Coordinate Source: geographic positioning system (transcription). not recorded. unverified.
In silty gravels in 20 cm of slowly-flowing water. Stuckenia filiformis, Myriophyllum verticillatum, Hippuris vulgaris, Sparganium spp. From Tricia Wurtz email 22Jun2011 to Alan Batten: I'm not sure you're aware that in January, Nick Lisuzzo and Amy Larsen collected some Elodea from two places in Chena Slough (through openings in the ice) and sent them to a faculty person at the University of Connecticut that is doing a genetic analysis of Elodea in North America. He analyzed the DNA and replied to them that although the samples appeared to be E. canadensis morphologically, based on their DNA they were E. nuttallii. Since then Nick has found other information that suggests that because Elodea is so phenotypically plastic, nuttallii and canadensis can be impossible to distinguish from one another based on their morphology, unless you have flowers. And they rarely produce flowers. Nick had given me some of the sample that he and Amy collected in January, and I maintained it for the rest of the winter in an aquarium in my house. It grew very readily after the sun started coming back and to my surprise it produced flowers. We feel quite confident the flowers showed that sample to be nuttallii. Amy talked about this at the Botany Forum, but you weren't there so we weren't sure you had heard about this development. Http://arctos.database.museum/guid/UAM:Herb:192171. Number of labels=4.

Alan R. Batten s.n., 30-Jul-2009
ALA, Catalog: UAM:Herb:192171, ALAAC=V166594