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Detail cross section of an old stem of castor bean

Legend:

1  epidermis
3  parenchyma
4  cambium
5  phelloderm
2  lenticel

English name: Castor bean
Scientific name: Ricinus communis
Familia: Euphorbiaceae
Classis: Dicotyledonas
Phylum: Angiospermae
Regnum: Plantae

A lenticel is formed under a stoma, permitting gas exchange. The other parts of the surface are isolated by cork deposition