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Legend:

1  cork
3  sclerenchyma
4  phloem
5  xylem
7  pith
2  cortex
6  ray

English name: Dutchman's pipe
Scientific name: Aristolochia sp.
Familia: Aristolochiaceae
Classis: Dicotyledonas
Phylum: Angiospermae
Regnum: Plantae

Cross-section through an old stem with secondary growth. A vascular cambium has been formed which deposits xylem (to the internal side) and phloem (to the external side). The cork cambium under the epidermis forms cork to the outside.