Cephalium

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Notion

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Science and technology

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What Wikipedia says

A cephalium is a growth that occurs in certain cacti at sexual maturity, that exhibits periderm development, reduced photosynthesis and denser spine production. The boundary between the juvenile plant and the cephalium is almost always a discrete one.

Excerpt from the Wikipedia article “Cephalium”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Stan Shebs, CC BY-SA 3.0, via Wikimedia Commons.