Egeria densa

Description

Egeria densa, or Brazilian waterweed, is a submerged aquatic plant with long, green stems and leaves arranged in whorls. Its leaves are lance-shaped, have finely serrated margins, and are 1-3 cm long. Egeria densa produces conspicuous white flowers with three petals that rise to or just above the water’s surface. The plant grows in freshwater bodies, forming dense mats, and is known for its ability to fragment and spread, often used in aquariums but also considered an invasive species in many regions.

Physical Characteristics

Colour:

Bright to dark green, especially in the water.

Habitat and Growth

Growth Habit: A submerged plant that can be anchored to the bottom or, when broken, can grow free-floating. Stems reach the surface to form dense mats.

Adaptation: Well-adapted to cold climates, surviving freezing conditions by storing starch.

Reproduction and Spread

Ecological Role and Usage

Oxygenator:

Historically used as an aquarium plant to oxygenate water and control mosquito larvae.

Invasive Potential:

Widely distributed through the aquarium trade, it is now considered an invasive species in many countries.