Lemna gibba

Fat Duckweed, a reference photo
Photo: Zeamays at English Wikipedia · CC BY 2.5 (licence)

Lemna gibba, the gibbous duckweed, swollen duckweed, or fat duckweed, is a species of Lemna (duckweed). It has a simple plant body, known as a thallus, which floats on the surface of the water and measures 3–5 mm (0.12–0.20 in) in diameter. A single root hangs down into the water. Found in a wide range of still or slow-flowing water bodies, this common duckweed can also grow on mud or damp rocks.

From Wikipedia, under CC BY-SA 4.0.

Is it poisonous?

We have no record of Fat Duckweed being toxic, poisonous or venomous. That is not proof that it is safe. Never eat, touch or handle a wild plant, mushroom or animal on the strength of an identification; ask someone qualified.

Easily confused with

Classification

Kingdom
Plantae
Phylum
Tracheophyta
Class
Liliopsida
Order
Alismatales
Family
Araceae
Genus
Lemna
Species
Lemna gibba

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