oxygen weed USDA PLANTS Symbol: LAMA15
U.S. Nativity:
Habit: Aquatic Plants
Lagarosiphon major (Ridley) Moss

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Taxonomic Rank: Liliopsida: Hydrocharitales: Hydrocharitaceae
Synonym(s): oxygen-weed, African elodea,South African oxygen weed

Appearance
Lagarosiphon major is a perennial, submerged aquatic plant that can grow in dense mats up to 6.6-9.8 ft. (2-3 m) thick.
Foliage
The stems, which can reach the surface, are brittle and sparsely branched, 0.12-0.2 in. (3-5 mm) in diameter and curved towards the base (J-shaped). The leaves are 0.2-0.8 in. (5-20 mm) long and 0.08-0.12 in. (2-3 mm) wide, and occur in alternate spirals along the stem.
Flowers
The flowers have three petals and are very small 0.01 in. (0.25 mm) in diameter and up to 2.4 in. (6 cm) long, and clear-white to pink on the surface.
Fruit
The fruit capsule is beaked with seeds 0.13 in. (0.32 cm) long, averaging nine to a fruit. Lagarosiphon major can also reproduce by stem fragments.
Ecological Threat
Lagarosiphon major is fast-growing and may completely fill the volume of a large shallow lake up to 9.8 in. (3 m) deep. It is native to southern Africa.

Identification, Biology, Control and Management Resources

Selected Images from Invasive.orgView All Images at Invasive.org


Plant(s);
Rohan Wells, National Institute of Water and Atmospheric Research, Bugwood.org
Additional Resolutions & Image Usage

Foliage;
Robert Vidéki, Doronicum Kft., Bugwood.org
Additional Resolutions & Image Usage

Foliage;
Robert Vidéki, Doronicum Kft., Bugwood.org
Additional Resolutions & Image Usage

EDDMapS Distribution:
This map is incomplete and is based only on current site and county level reports made by experts and records obtained from USDA Plants Database. For more information, visit www.eddmaps.org
 


State(s) Where Reported invasive.
Based on state level agency and organization lists of invasive plants from WeedUS database.


Invasive Listing Sources: