An official website of the United States government.

The .gov means it’s official.
Federal government websites always use a .gov or .mil domain. Before sharing sensitive information online, make sure you’re on a .gov or .mil site by inspecting your browser’s address (or “location”) bar.

This site is also protected by an SSL (Secure Sockets Layer) certificate that’s been signed by the U.S. government. The https:// means all transmitted data is encrypted — in other words, any information or browsing history that you provide is transmitted securely.

Oxygen Weed

View all resources
Oxygen weed
Oxgen weed - Photo by Rohan Wells; National Institute of Water and Atmospheric Research
Scientific Name: 

Lagarosiphon major (Ridley) Moss (ITIS)

Common Name: 

Oxygen weed, Lagarosiphon, African elodea, curly waterweed

Native To: 

Southern Africa (Nault and Mikulyuk 2009)

Date of U.S. Introduction: 

Not introduced

Means of Introduction: 

Spread throughout the world as an aquarium plant (Nault and Mikulyuk 2009)

Impact: 

Has invaded New Zealand and Europe. It can inhabit freshwater lakes, dams and slow moving streams. Forms dense mats that block sunlight, thereby killing native aquatic plant and animal species, which could rival the harmful effects of hydrilla (Csurhes and Edwards 1998)

Current U.S. Distribution: 
Not currently established

Federally Regulated

USDA. APHIS. Plant Protection and Quarantine.

Includes species listed as a Federal Noxious Weed under the Plant Protection Act, which makes it illegal in the U.S. to import or transport between States without a permit.

Images

University of Georgia. Center for Invasive Species and Ecosystem Health.

Videos

Google. YouTube; RTÉ Ireland. Eco Eye.

This beautiful episode opens on Lough Corrib at sunrise. Anja sees first-hand the devastating and costly impacts of a new arrival to an existing ecosystem, Lagarosiphon Major a pond weed has taken hold in the waterbody. Part 1 of 4

Selected Resources

The section below contains highly relevant resources for this species, organized by source. Or, to display all related content view all resources for Oxygen Weed.

Partnership
IUCN. Species Survival Commission. Invasive Species Specialist Group.

Centre for Invasive Species Solutions; Atlas of Living Australia; Australian Government. Department of Agriculture, Water and the Environment.

Federal Government
International Government
State and Local Government
Academic

University of California. Weed Research and Information Center.

See also: Weeds in Natural Areas for more information sheets

University of Florida. IFAS. Center for Aquatic and Invasive Plants.

Citations