"Hydrilla" closely resembles some other related aquatic plants, including "Egeria densa" and "Elodea canadensis". Submerged vegetation includes coontail, fanwort, elodea and southern naiad. The spring runs themselves are often home to pickerel weed, arrowhead, elodea and eel grass. The invasive species "Elodea canadensis" was introduced to the lake in the 1950s. Common names include African elodea, curly waterweed, oxygen weed and South African oxygen weed. Elodea is threatening aquatic environments across Europe. Sphingomonas elodea is a species of bacteria in the genus "Sphingomonas". The habitat is heavily vegetated with Hydrocharitaceae similar to "Elodea" (water weed). It is similar to its relative, "Elodea canadensis". Plants such as "Elodea" and others have been recorded from the Lagan. "Elodea" plants inhabit the lower reaches of Sechler Run in Danville. In the Netherlands, the invasive "Elodea nuttallii" may compete with it for habitat. "Stratiotes aloides", "Hydrocharis morsus-ranae", "Acorus calamus", "Myriophyllum" species and "Elodea" have been used.