Egeria has dark green, lance-like leaves that are in whorls of 4 to 6
which become more dense near the tip of the stem. Egeria is often confused with the native Elodea or the non-native Hydrilla.
Hydrilla has one or more teeth on the underside of the midrib, neither Elodea nor Egeria have these midrib teeth.
The teeth make Hydrilla feel rough when drawn through your hand from base to tip.
Flowers of Egeria are larger than Hydrilla. Egeria leaves are larger than elodea and in whorls of 4–6
and not 3 as with Elodea.