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Old stem

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1  epidermis
3  primary and secondary phloem
4  cambium
5  secondary xylem
7  pith
2  cortex
6  primary xylem

English name: Castor bean
Scientific name: Ricinus communis
Familia: Euphorbiaceae
Classis: Dicotyledonas
Phylum: Angiospermae
Regnum: Plantae
Cross-section through an older stem with secondary growth. Fascicular cambium forms xylem to the internal side and phloem to the external side. Alignment of cells in rows is typical for tissue of secondary origin.
View a detail of this stage or compare with an earlier stageprimary

last modified: 5 Jun 2014