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Hair on the surface of a leaf of petunia
English name: Petunia
Scientific name: Petunia sp.
Hairs are common structures of the surface of leaves. They protect the plant against desiccation, predators or parasites. Hairs are specific epidermal appendages (trichomes). This petunia hair is multicellular. It contains a secretion cell (glandular cell) at its tip which secretes etherical oils that defend the plant against various aggression by other organisms.