| Detail cross section of an old stem of castor bean |
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With labels
Legend:
1 epidermis
3 parenchyma
4 cambium
5 phelloderm
2 lenticel
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English name: Castor bean
Scientific name: Ricinus communis
Familia: Euphorbiaceae
Classis: Dicotyledonas
Phylum: Angiospermae
Regnum: Plantae
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| A lenticel is formed under a stoma, permitting gas exchange. The other parts of the surface are isolated by cork deposition |