Hesperidium

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A schematic picture of orange hesperidium.
A schematic picture of orange hesperidium.

A hesperidium (plural hesperidia) is a modified berry with a tough, leathery rind. The peel contains volatile oil glands in pits. The fleshy interior is composed of separate sections, called carpels, filled with fluid-filled vesicles that are actually specialized hair cells.

Oranges and other citrus fruits are common examples.

Unlike many other berries, the rind of hesperidia are generally not eaten with the fruit because they are tough and bitter. However, the outermost, coloured layer of rind is not bitter and is sometimes scraped off and used as a culinary ingredient called zest.

  • Bailey, H. and E. BAILEY. 1976. Hortus Third. Cornell University MacMillan. N.Y. p275
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