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Upcoming Events

  • May 24

    School Program

    May 24th 9:30 am - 10:30 am

    Sibley welcomes Mylam Elementary Kindergarteners…

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  • May 24

    School Program

    May 24th 1:00 pm - 2:30 pm

    Sibley welcomes Rusk Elementary 5th graders…

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  • May 25

    Brown Bag Lecture

    May 25th 12:00 pm - 1:00 pm

    Sibley Welcomes Greg Pavur to speak about Swift Foxes. Bring your lunches, tea and cookies will be provided. This event is open to the public.…

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  • May 26

    School Program

    May 26th 9:30 am - 11:00 am

    Sibley welcomes Bush Elementary pre-K…

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  • May 26

    Gem and Mineral Society Meeting

    May 26th 7:00 pm - 9:00 pm

    Come and learn about Rock Tumbling. Talk with the masters about how they get their rocks so smooth and shiny. …

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Trichomes are fine outgrowths of the epidermis of plants. They are diverse in both structure and function. Trichome diversity in form include hairs, glands, scales, and papillae. Hairs on plants are extremely variable: they may be unicellular or multicellular, branched or unbranched. Their location on a plant, their size, and their density correlate to their function. There are several basic functions and advantages for a plant having surface hairs. Some types of hair may provide a plant with defenses against herbivory; some hairs may protect against frost damage. Some types of hairs break up the flow of air across a plant’s surface, thus reducing water loss. Dense coatings of hair reflect sunlight giving a degree of protection from UV. Hairs can also enhance the collection of moisture from fog. Glandular hairs produce secretions of various substances like salt-solution, nectar, lipids, and gums. Most glandular trichomes possess endodermal cells below the secretory cells to prevent the backflow of the secretions.

There are numerous terms plant taxonomists use in the description of the surface appearance of a plant’s organs, and many refer to the presence, form, texture, and density of the trichomes. The most basic terms commonly used, however, are glabrous---lacking hairs---and pubescent---having hairs.