duck-lettuce USDA PLANTS Symbol: OTAL
U.S. Nativity: Exotic
Habit: Aquatic Plants Forbs/Herbs
Ottelia alismoides (Linnaeus) Pers.

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Taxonomic Rank: Liliopsida: Hydrocharitales: Hydrocharitaceae
Synonym(s): duck lettuce, ducklettuce

Appearance
Ottelia alismoides is a submersed aquatic herbaceous plant that is native to Africa, Asia, Australia, and the Pacific. The plant is entirely submersed except for the flower. Its common name, duck lettuce, comes from the strong resemblance the leaves of O. alismoides bears to lettuce leaves.
Foliage
The leaves of O. alismoides are completely submersed. Leaf blades are lanceolate to widely ovate, ranging from 4-10 in. (10-25 cm) long. The veins in the leaves run parallel.
Flowers
The small terminal flower is held on a long peduncle which projects it above the surface of the water. The flower may open fully even when still submersed. Flowers of O. alismoides have obovate petals that range from white to pinkish in color with bright yellow anthers. They bloom from spring through summer.
Fruit
O. alismoides reproduces only by seed. The ribbed oblong fruits range from 0.05-0.13 in. (15-40 mm) long with a beaked tip. It can produce up to 2000 seeds.
Ecological Threat
Ottelia alismoides is a federally listed noxious weed. It can be found Louisiana, California, Missouri and Florida. It was reported in waterways along the border between Texas and Louisiana. O. alismoides prefers habitats with shallow water from about 0-164 ft. (0-50 m) deep. This may include bayous, pools, and lakes.

Identification, Biology, Control and Management Resources

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


Plant(s);
Dave Wilson, , Bugwood.org
Additional Resolutions & Image Usage

Plant(s);
Dave Wilson, , Bugwood.org
Additional Resolutions & Image Usage

Plant(s); Australia
John Wrigley, Australian National Botanic Gardens, Bugwood.org
Additional Resolutions & Image Usage

Plant(s); Removed from the water
California Department of Food and Agriculture , , Bugwood.org
Additional Resolutions & Image Usage

Seed(s);
California Department of Food and Agriculture , , Bugwood.org
Additional Resolutions & Image Usage

Plant(s);
H. Barth Dessau, , Bugwood.org
Additional Resolutions & Image Usage

Flower(s);
California Department of Food and Agriculture , , Bugwood.org
Additional Resolutions & Image Usage

Flower(s);
Ronald Stroessner, , Bugwood.org
Additional Resolutions & Image Usage

Seed(s); Seeds. FNW taxon.
Julia Scher, USDA APHIS PPQ, Bugwood.org
Additional Resolutions & Image Usage

Fruit(s); Partial dried fruit. FNW taxon.
Julia Scher, USDA APHIS PPQ, Bugwood.org
Additional Resolutions & Image Usage

Seed(s); Seeds. FNW taxon.
Julia Scher, USDA APHIS PPQ, Bugwood.org
Additional Resolutions & Image Usage

Seed(s); Seeds. FNW taxon.
Julia Scher, USDA APHIS PPQ, 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: