Water lettuce (Pistia stratiotes)

Apu-apu or water lettuce (Pistia stratiotes) is a species of plant in the Araceae, a perennial monocot with thick and soft leaves that form a rosette, floats on the surface of the water, roots hanging and submerged under floating leaves, grows in watery habitats, rice fields, canals. freshwater and marshes.

P. stratiotes has bright green leaves, 2-15 cm long, parallel venation and wavy edges. The surface is covered in short, white hairs that form a basket-like structure and trap air bubbles for increased buoyancy.

Sponge parenchyma with large intercellular spaces also helps the plant to float. Flowers are dioecious, have no petals and are hidden between the leaves.

Spadix inflorescence with 1 pistil, 1 ovary and 2-8 stamens with 2 stamens. The pistil and carpel are separated by folds in the spathe, where the male flower lies above the female flower.

Berries are green, oval in shape, ovoid seeds are formed after fertilization. Plants undergo asexual reproduction via stolons, but evidence of sexual reproduction has also been observed.

Apu-apu is found in slow-moving rivers, lakes, and ponds. Optimal growth at 22-30C, but can withstand temperature extremes up to 35C. This species also requires slightly acidic water in the pH range of 6.5-7.2.

Kingdom: Plantae
Phylum: Tracheophyta
Subphylum: Angiospermae
Class: Liliopsida
Order: Alismatales
Family: Araceae
Subfamily: Aroideae
Tribe: Pistieae
Genus: Pistia
Species: Pistia stratiotes

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