Citrus
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- Texas A&M AgriLife Extension - Fruit & Nut Resources - Citrus
- Nature - Genomics of the origin and evolution of Citrus
- University of Florida - IFAS Extension - Citrus Propagation
- Home & Garden Information Center - Citrus
- Food and Agriculture Organization of the United Nations - Citrus Fruit
- National Center for Biotechnology Information - PubMed Central - Citrus fruits as a treasure trove of active natural metabolites that potentially provide benefits for human health
- Key People:
- James Lind
- Sir Gilbert Blane, 1st Baronet
- Related Topics:
- orange
- lemon
- lime
- grapefruit
- citron
Citrus, genus of plants belonging to the rue family (Rutaceae), and yielding pulpy fruits covered with fairly thick skins. Economically important plants in this group include the lemon (C. ×limon), lime (C. ×aurantiifolia), sweet orange (C. ×sinensis), sour orange (C. ×aurantium), tangerine (C. reticulata), grapefruit (C. ×paradisi), citron (C. medica), and shaddock (C. maxima). Yuzu is the most cold-resistant of all citrus fruits, capable of growing at high altitudes at temperatures just above freezing, and most commonly associated with Japan and Japanese cuisine.
Citrus plants are typically evergreen trees or shrubs with glossy oval-shaped leaves; many species have thorns. The flowers are usually white with five petals and are very fragrant. The fruits are a type of modified berry known as a hesperidium, and the flesh is divided into segments packed with tiny juice-filled vesicles. The peel, or rind, of the fruits is leathery and studded with oil glands.
