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Detail cross section of an young stem of castor bean

Legend:

1  fascicular cambium
3  phloem
4  xylem
2  interfascicular cambium

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

The fascicular cambium originates between xylem and phloem from procambium cells. Cells in the cortex differentiate to interfascicular cambium. Together they form a closed ring