California Invasive Plant Council

Egeria densa

Common names: Brazilian Egeria; Egeria

Egeria densa (Brazilian Egeria) is a common aquatic perennial (family Hydrocharitaceae) that occurs in lakes, springs, ponds, and streams. Its underwater growth significantly retards water flow and decreases the abundance and diversity of native plant seeds in lake bottoms. It was introduced as a freshwater aquarium plant.

Cal-IPC Rating: High?

Explanation of Cal-IPC ratings

• High – These species have severe ecological impacts on physical processes, plant and animal communities, and vegetation structure. Their reproductive biology and other attributes are conducive to moderate to high rates of dispersal and establishment. Most are widely distributed ecologically.
• Moderate – These species have substantial and apparent-but generally not severe-ecological impacts on physical processes, plant and animal communities, and vegetation structure. Their reproductive biology and other attributes are conducive to moderate to high rates of dispersal, though establishment is generally dependent upon ecological disturbance. Ecological amplitude and distribution may range from limited to widespread.
• Limited – These species are invasive but their ecological impacts are minor on a statewide level or there was not enough information to justify a higher score. Their reproductive biology and other attributes result in low to moderate rates of invasiveness. Ecological amplitude and distribution are generally limited, but these species may be locally persistent and problematic.
• Alert – An Alert is listed on species with High or Moderate impacts that have limited distribution in California, but may have the potential to spread much further.
• Watch – These species have been assessed as posing a high risk of becoming invasive in the future in California.

CDFA Rating: None?

Explanation of CDFA ratings

• A – A pest of known economic or environmental detriment and is either not known to be established in California or it is present in a limited distribution that allows for the possibility of eradication or successful containment.
• B – A pest of known economic or environmental detriment and, if present in California, it is of limited distribution.
• C – A pest of known economic or environmental detriment and, if present in California, it is usually widespread.
• D – An organism known to be of little or no economic or environmental detriment, to have an extremely low likelihood of weediness, or is known to be a parasite or predator.
• Q – An organism or disorder suspected to be of economic or environmental detriment, but whose status is uncertain because of incomplete identification or inadequate information.
• * – An asterisk next to the rating indicates that a plant is included in the CCR Section 4500 list of California State Noxious Weeds.
• -* – This plant is included in the CCR Section 4500 list of California State Noxious Weeds, but is otherwise not rated.

More details

Assessment(s)

Egeria densa Plant Assessment Form - Information gathered by Cal-IPC on the impacts, rate of spread, and distribution of invasive plants in California. Does not include management information.

Weed Management Notes

• Management Notes - Information on management techniques and effectiveness from the University of California Cooperative Extension’s Weed Research & Information Center.

Cal-IPC Newsletter Articles

• Wildland Weed News. Cal-IPC. Vol 22, Issue 2
• The cost of weeds to California. Brusati, Elizabeth. Vol 17, Issue 1

Cal-IPC Symposium Presentations

Presentations are linked where available. Where a presentation is not available, find more information by reading the abstract in the Cal-IPC Symposia Archive.

• Adaptive management of invasive aquatic vegetation in the Delta: Successes and challenges. Brusati, Elizabeth (2024)
• Biological control of aquatic weeds in California: Status update and a look to the future. Pratt, Paul (2023)
• Managing Egeria densa and other invasive aquatic plants as part of the Delta Smelt Resiliency Strategy. Rasmussen, Nick; Green, Heather; Khanna, Shruti; Caudill, Jeffrey; Ateljevich, Eli; Conrad, Louise (2017)
• Utilizing differential quantitative mapping technologies and traditional botanical knowledge to assist Brazilian waterweed management in the Sacramento-San Joaquin Delta: An example from Frank_s Tract. Ruch, Scott; Shanayda, Kurt; California Dept. of Boating and Waterways Aquatic Weed Unit, (2006)
• Water gardening: Pathway to paradise or plant invasion? Crosson, Holly A. (2004)
• Aquatic weeds: Policy, prevention, and control. Anderson, Lars (2003)

Other Egeria densa Information

• CalPhotos - Images of plants taken mostly in California.
• Calflora - Distribution map and records of this species in California.
• CalWeedMapper - Distribution map of this species in California with ability to determine regional priorities.
• EDDMapS - Distribution of this species in North America.
• Jepson Interchange - Information on this plant's taxonomy, biology, and distribution from UC Berkeley's Jepson Herbarium.
• USDA PLANTS Database - Information on identification and distribution, with links to websites in individual states.

Additional photos