Find a Citrus images for your creative needs, desktop wallpaper or Android device. Citrus is a genus of flowering trees and shrubs in the rue family, Rutaceae. Plants in the genus produce citrus fruits, including important crops like oranges, lemons, grapefruit, pomelo and limes.
The most recent research indicates an origin in Australia, New Caledonia and New Guinea. Some researchers believe that the origin is in the part of Southeast Asia bordered by Northeast India, Burma (Myanmar) and the Yunnan province of China, and it is in this region that some commercial species such as oranges, mandarins, and lemons originated. Citrus fruit has been cultivated in an ever-widening area since ancient times.Citrus taxonomy refers to the botanical classification of the species, varieties, cultivars, and graft hybrids within the genus Citrus, subgenus Papeda, and related genera, found in cultivation and in the wild.
Citrus taxonomy is complex. Cultivated citrus are derived from various citrus species found in the wild. Some are only selections of the original wild types, while others are hybrids between two or more ancestors. Citrus plants hybridize easily between species with completely different morphologies, and similar-looking citrus fruits may have quite different ancestries. Conversely, different-looking varieties may be nearly genetically identical, and differ only by a bud mutation.
Most hybrids express different ancestral traits when planted from seeds (F2 hybrids) and can continue a stable lineage only through vegetative propagation. Others do reproduce true to type via nucellar seeds in a process called apomixis. Some differ only in disease resistance.
Clear genetic lineages are very important for breeding improved cultivars. Only two citrus cultivars have had their full genomes sequenced, and both are hybrids (sweet oranges and clementines). Many different phylogenies for the non-hybrid citrus have been proposed, and taxonomic terminology is not yet settled.Citrus hystrix, called the kaffir lime, makrut lime (US: ; UK: ) or Mauritius papeda, is a c ...
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