Elodea species - Waterweeds

There are two common Elodea in VC77.

Elodea canadensis Canadian Waterweed

This has (mainly) paired leaves with blunt / obtuse tips which are > 0.8 mm wide 1mm behind the tip.

Elodea nuttallii Nuttall’s Waterweed

This has whorls of (2) 3 - 4 (5) leaves with acute tips and the leaves are < 0.8 mm wide 1mm behind the tip.

Elodea canadensis NS8943 24June2018 PW

Elodea canadensis NS94X 2June2018 PW

Elodea nuttallii NS7066 07Jul2018 PW

Comparison of Elodea species

E. canadensis is on the left with paired leaves and blunter tip.

E. nutalli on the right, with three leaves and sharper tip.

Elodia NS9840 11May2019 PW