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Hairs and glandular cells in the upperepidermis of a petunia leaf

Legend:

1 epidermal cells
3  multicelllular hair
4 secretory cells at the tip of a hair
2  stomata

English name: Petunia
Scientific name: Petunia sp.
Familia: Solanaceae
Classis: Dicotyledonas
Phylum: Angiospermae
Regnum: Plantae

Hairs often occur at the surface of leaves as a protection against desiccation of pray. Hairs are elongated extensions (trichomes) of the epidermis. This particular hair of a petunia leaf is multicellular. At its top a secretion cell produces etherical oils that desists many organisms