The waterweeds (Elodea and Egeria, Hydrocharitaceae) in Canada

The waterweeds (Elodea and Egeria, Hydrocharitaceae) in Canada. Catling, P., M. & Wojtas, W. Canadian Journal of Botany, 64(8):1525-1541, 7, 1986.

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A study of herbarium material of Elodea spp. and Egeria densa was undertaken to document status in Canada and to evaluate existing methods of identification. Except in Elodea longivaginata, nonflowering plants are 2 – 3 times more common than flowering plants and females are more common than males. Leaf width partially separates E. canadensis and E. nuttallii males but not females. The ratio of pistillate sepal length versus leaf width separates female E. canadensis from female E. nuttallii, but intermediates exist. Nonflowering plants with leaf widths of 1.8 – 2.2 mm are treated as unknowns. Bifid styles are characteristic of E. longivaginata. Keys, descriptions, and drawings based on Canadian material are provided. The introduced Egeria densa occurs rarely in southwestern British Columbia. Elodea longivaginata and E. nuttallii are both rare native species, the former occurring in southern Alberta and southern Saskatchewan and the latter occurring in southern Ontario and southern Québec, Nova Scotia, sou..., Une étude de matériel d'herbier de l'Elodea spp. et du Egeria densa a été faite dans le but de documenter leur statut au Canada et d'évaluer les méthodes existantes d'identification. À l'exception du cas Elodea longivaginata, les plantes aflores sont 2 – 3 fois plus communes que celles qui sont florifères, et les individus femelles sont plus communs que les individus mâles. La largeur des feuilles assure une séparation partielle des individus mâles des E. canadensis et E. nuttallii, mais non celle des individus femelles. Le rapport de la longueur des sépales des fleurs pistillées versus la largeur des feuilles sépare les E. canadensis femelles des E. nuttallii femelles, mais des types intermédiaires existent. Les plantes non florifères ayant une largeur de feuille entre 1.8 et 2.2 mm sont traitées comme inconnues. Des styles bifides caractérisent le E. longivaginata. Des clefs, des descriptions et des dessins basés sur du matériel canadien sont fournis. La plante introduite Egeria densa se retrouve rareme...

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 abstract = {A study of herbarium material of Elodea spp. and Egeria densa was undertaken to document status in Canada and to evaluate existing methods of identification. Except in Elodea longivaginata, nonflowering plants are 2 – 3 times more common than flowering plants and females are more common than males. Leaf width partially separates E. canadensis and E. nuttallii males but not females. The ratio of pistillate sepal length versus leaf width separates female E. canadensis from female E. nuttallii, but intermediates exist. Nonflowering plants with leaf widths of 1.8 – 2.2 mm are treated as unknowns. Bifid styles are characteristic of E. longivaginata. Keys, descriptions, and drawings based on Canadian material are provided. The introduced Egeria densa occurs rarely in southwestern British Columbia. Elodea longivaginata and E. nuttallii are both rare native species, the former occurring in southern Alberta and southern Saskatchewan and the latter occurring in southern Ontario and southern Québec, Nova Scotia, sou..., Une étude de matériel d'herbier de l'Elodea spp. et du Egeria densa a été faite dans le but de documenter leur statut au Canada et d'évaluer les méthodes existantes d'identification. À l'exception du cas Elodea longivaginata, les plantes aflores sont 2 – 3 fois plus communes que celles qui sont florifères, et les individus femelles sont plus communs que les individus mâles. La largeur des feuilles assure une séparation partielle des individus mâles des E. canadensis et E. nuttallii, mais non celle des individus femelles. Le rapport de la longueur des sépales des fleurs pistillées versus la largeur des feuilles sépare les E. canadensis femelles des E. nuttallii femelles, mais des types intermédiaires existent. Les plantes non florifères ayant une largeur de feuille entre 1.8 et 2.2 mm sont traitées comme inconnues. Des styles bifides caractérisent le E. longivaginata. Des clefs, des descriptions et des dessins basés sur du matériel canadien sont fournis. La plante introduite Egeria densa se retrouve rareme...},
 bibtype = {article},
 author = {Catling, Paul M and Wojtas, Walter},
 journal = {Canadian Journal of Botany},
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