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Detail of the onset of leaf formation in Elodea (pondweed)

Legend:

1  leaf primordium
2  air cavity

English name: Pondweed
Scientific name: Elodea sp.
Familia: Hydrocharitaceae
Classis: Monocotyledonas
Phylum: Angiospermae
Regnum: Plantae

Leaves of Elodea consist of only two layers of cells. There is no vascular system in the leaves