Close up of cactus showing spines arising from areolae.
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Botanical Nerd Word: Areola

Areola: The area or organ from which spines, flowers, or new branches appear.*

The term areola can also refer to any small, well-defined space such as the area between the veins on a leaf.

*Lamb, B. M. (1991). Letts guide to cacti of the world. London: Letts.

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