Curly Waterweed (Lagarosiphon major)

Curly Waterweed, a reference photo — Photo: Dr Mary Gillham Archive Project · CC BY 2.0 (licence)

Lagarosiphon major is a monocotic aquatic plant native to Southern Africa. Common names include African elodea, curly waterweed, oxygen weed and South African oxygen weed. It is used as freshwater aquarium plant.

From Wikipedia, under CC BY-SA 4.0.

Is it poisonous?

We have no record of Curly Waterweed 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

Elodea densa
Hydrilla verticillata
Elodea nuttallii
Elodea canadensis

Classification

Kingdom: Plantae
Phylum: Tracheophyta
Class: Liliopsida
Order: Alismatales
Family: Hydrocharitaceae
Genus: Lagarosiphon
Species: Lagarosiphon major

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