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| | Top 20 Encyclopedia |
 | | Citrus is sometimes used as a food plant by the larvae of some Lepidoptera species including Common Emerald and Double-striped Pug. |
| | In botanical terms, "The fruit of all Citrus trees, in which the true fruit is the peel, [is] made up of an outer layer, brightly colored and rich in glands, a spongey whitish mesocarp, and a membraneous endocarp surrounding the segments. |
| | As citrus trees hybridize very rapidly (e.g., seeds grown from limes can produce fruit similar to grapefruit), all commercial citrus cultivation uses trees produced by grafting the desired fruiting cultivars onto rootstocks selected for disease resistance and hardiness. |
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