5. Young stem transverse section: epidermis (ep), underlying collenchyma (coll) of the cortex (c), fibers (f), phloem (ph), xylem (x), large central pith (p), and secretory ducts (sd) in the cortex.

6. Older stem transverse section: epidermis (ep), lamellar collenchyma (coll) exterior to parenchyma (par) in the cortex, secretory duct (sd), fibers (f) capping the phloem (ph), and xylem (x) with vessels and parenchyma.

7. Petiole transverse section: epidermis (ep), collen-chyma (coll), phloem (ph), xylem (x), secretory duct (sd), and pith (p).

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