Duck Lettuce scientifically known as Ottelia alismoides is a submersed fresh aquatic herbaceous plant belonging to Hydrocharitaceae (Tape-grass family). The plant is native to Africa, Asia, northern Australia, and the Pacific. In China, it is distributed in Yunnan, Sichuan, Guangxi, Guangdong, Hunan, Hubei, Jiangxi, Fujian Zhejiang, Anhui, Jiangsu and Henan. Apart from Duck Lettuce it is also known as Water-plantain ottelia and ottelia. Its common name, duck lettuce, comes from the strong resemblance the leaves of O. alismoides bears to lettuce leaves. It reproduces solely by seeds, is slow to spread, and is generally not considered a top invasive plant in the United States. It is, however, a Federally Listed Noxious Weed. The plant is harvested from the wild for local use as a food and medicine. It is grown in ponds, where it helps to keep the water clear, and is also sometimes grown as an aquarium plant.

Duck Lettuce Facts

Duck Lettuce Quick Facts
Name:	Duck Lettuce
Scientific Name:	Ottelia alismoides
Origin	Africa, Asia, northern Australia, and the Pacific
Shapes	Ribbed, ellipsoid to ovoid, rarely cylindrical fruits, 2.5 to 4 centimeters long and 1-2 cm wide with a beaked tip
Health benefits	Support hemorrhoids, fever, abscesses of the breasts, cancer, ulcers, burns, bilateral tuberculosis of the cervical lymph glands.

Name	Duck Lettuce
Scientific Name	Ottelia alismoides
Native	Africa, Asia, northern Australia, and the Pacific. In China, it is distributed in Yunnan, Sichuan, Guangxi, Guangdong, Hunan, Hubei, Jiangxi, Fujian Zhejiang, Anhui, Jiangsu, Henan
Common Names	Duck lettuce, Water-plantain ottelia, ottelia
Name in Other Languages	Arabic: Uwtilia mizmaria (أوتليا مزمارية) Assamese: Hentepa/ Kechoir/ Panikola, Panikola Bengali: Parmikalla, Pānikalā (পানিকলা), Ram korola, Kaobali, Torukola, Shyamkola, Kuchkolai, Jol-kolosh, Pani-kolosh, Jol-kola Chinese: Shui bai cai, Lung she ts’ao, Shui che qian, Long she cao, Shuǐ chēqiáncǎo (水車前草), Lóng shé cǎo (龙舌草) Dutch: Duikerbloem English: Duck lettuce, Water-plantain ottelia, ottelia French: Ottélie German: Froschlöffelähnliche Ottelie India: Pokok kelur, Dainithalir Italian: Erba coltella delle risaie, mestolaccia falsa, ottelia Japanese: Mizu-ôba-Ko (ミズオオバコ), mizuô-bako (ミズオウバコ), ômizu-ôbako (オウミズオウバコ) Kannada: Hasiru neeru paathre, Kottigenau balli, ga neun ip mul jil gyeong I (가는잎물질경이) Korean: Mul jil gyeong (물질경이) Malay: Keladi ayer, Kreboboth Malayalam: Ottel-ambel, oṭṭeliya alismēāyiḍes (ഒട്ടെലിയ അലിസ്മോയിഡെസ്) Manipuri: Lairenchak Marathi: Olek alsem, Bhat(Rice)-kamal Min Dong: Liék-siĕk-chāu Myanmar: Ye-hnyi Netherlands: Duikerbloem Russian: otteliya chastukhovidnaya (оттелия частуховидная) Spanish: Espada, Tangila Swedish: Ottelia Tamil: Nirkkuliri Telugu: Edukula thaamara, Neeru veniki Thai: Santawa, S̄ạntawā bı phāy (สันตะวาใบพาย)
Plant Growth Habit	Short-stemmed, robust, completely submersed, rooted, aquatic herbaceous plant
Growing Climates	Shallow fresh water of lakes and bayous, slow-moving streams, stagnant pools, on a muddy bottom, along lake shorelines, marsh ponds, irrigation ditches and stream margins in water and in rice field
Root	Roots are fibrous
Stem	Small and corm-like, occasionally forked, with fibrous roots
Leaf	Leaf blades of the submerged leaves are often narrow; the floating ones are ovate or somewhat rounded, with a rounded or often heart-shaped base, 7 to 22 centimeters long and 4.5 to 21 cm wide
Flower	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. Sepals are 1-1.5 cm long. Flowers have obovate petals 2-3 cm long, that range from white to pinkish in color with bright yellow anthers
Fruit Shape & Size	Ribbed, ellipsoid to ovoid, rarely cylindrical fruits, 2.5 to 4 centimeters long and 1-2 cm wide with a beaked tip
Plant Parts Used	Leaves, flowers
Propagation	By seed or sucker separation

Plant Description

Duck Lettuce is a short-stemmed, robust, completely submersed, rooted, aquatic herbaceous plant native to the rice fields of southeastern Asia, but has naturalized to Louisiana, California, and more recently Missouri and Florida. The plant is found growing in shallow fresh water of lakes and bayous, slow-moving streams, stagnant pools, on a muddy bottom, along lake shorelines, marsh ponds, irrigation ditches and stream margins in water and in rice field. Stem is small and corm-like, occasionally forked, with fibrous roots.

Leaves

Leaves are extremely variable, with short or long petioles, according to the depth of the water. Leaf blades of the submerged leaves are often narrow; the floating ones are ovate or somewhat rounded, with a rounded or often heart-shaped base, 7 to 22 centimeters long and 4.5 to 21 cm wide. The veins in the leaves run parallel. Leaf-margins are entire or denticulate.

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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. Sepals are 1-1.5 cm long. Flowers have obovate petals 2-3 cm long, that range from white to pinkish in color with bright yellow anthers. They bloom from spring through summer.

Fruits

Fertile flowers are followed by ribbed, ellipsoid to ovoid, rarely cylindrical fruits, 2.5 to 4 centimeters long and 1-2 cm wide with a beaked tip. It can produce up to 2000 seeds. Duck Lettuce reproduces only by seed. Seeds are narrowly cylindric, 0.9–1.3 mm. long and 0.3–0.5 mm. wide, dark purple to black, with longitudinal striations.