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Term Definition
Malpighiaceous trichomes Hairs that are unicellular, appressed, and attached by the middle; common in the Malpighiaceae, in which they can be T-shaped or Y-shaped.
Trichomes Any structure arising from the epidermis (surface) of a plant; the equivalent to hairs in an animal. Pilose indumentum. Photo by S. A. Mori.
Trichomes in axillary tufts Trichomes (the equivalent of hairs in the animal kingdom) usually located in the axils between the midribe and the secondary veins, e.g., in Quercus velutina (black oak). Axillary trichomes. Photo by S. A. Mori.
Urticating trichomes Trichomes that cause itching or burning sensations such as in some species of Euphorbiaceae and Urticaceae; sometimes called urticating hairs but urticating trichomes is preferred because it limits the term to plants. Urticating trichomes are thought to protect the plant from predators. Utricating trichomes. Drawing by B. Angell.