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Detail cross section of an old stem of castor bean

Legend:

1  vascular cambium ring
3  xylem
4  parenchyma
2  phloem

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

Cambium cells divide only in periclinal direction so that the newly formed cells are aligned in rows. These new cells differentiate to xylem (inward) and to phloem (outward)