Virginia Tech Weed Identification Guide

Brazilian Elodea or Egeria: Egeria densa

Weed Description: Submersed aquatic weed that can be found throughout the southeastern United States in ponds, lakes, streams, and rivers.

Stems: May reach 6 feet in length and are freely branching.  Roots can be formed in the areas where the branching occurs.  Stems can be either rooted below or free-floating.

Leaves:  May occur in whorls of 3 to 6 but are most commonly found in whorls of 4.  Individual leaves are linear to oblong in outline, approximately 1 to 1 1/4 inches long and 5 mm wide.  Leaves have leaf margins that are finely toothed, but these are hardly noticeable without a magnifying glass.  The undersides of the leaf midribs are smooth and without teeth unlike those of hydrilla. belodea12-28c.jpg (134554 bytes)
Flowers: Consist of 3 white petals and 3 green sepals.  Individual flowers are relatively large and showy, with petals that are approximately 1/3 inch long.  Flowers usually appear just at the water surface due to long (1 to 4 inches) flower stalks (pedicels) that arise from the areas between the leaves and the stems (leaf axils).
Identifying Characteristics: Submersed aquatic weed with leaves arranged in whorls of 3 to 6 and showy flowers with 3 white petals.  Brazilian elodea may be easily mistaken for Hydrilla.  However, hydrilla has leaves with teeth on the undersides of the leaf midribs and also has much smaller flowers.  Hydrilla also produces tubers unlike Brazilian elodea. belodea12-28.jpg (114968 bytes)