September 22
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Plant Species of the genus Citrus

Information about this genus
Name: Citrus
Cultivation: CULTIVATION: In frost-free conditions most citrus thrive in fertile well-drained soil in a sunny position protected from wind. During the growing season they need plenty of water and regular small applications of nitrogenous fertilizer to promote growth and fruit size. In general, citrus need very little pruning, except to remove shoots arising from below the graft union and, when mature, to remove dead or damaged branches and overcrowding within the tree. Citrus grown on dwarfing rootstocks make excellent decorative and productive fruiting trees for large pots. These should be positioned where they receive plenty of sunlight and shelter from wind; where frosts are common they should be moved under cover over winter. Propagation is by budding or grafting the desired citrus onto a suitable rootstock.
Description: Ranging in the wild from China to India, Southeast Asia, New Guinea and Australia, this genus comprises about 20 species of evergreen shrubs and small trees. Some species and many hybrid cultivars are grown in warmer countries of the world for their edible fruits, the oranges, lemons, limes, grapefruit and mandarins among others. Recent studies have concluded that all the major citrus fruits have evolved in cultivation from just 3 wild parent species, namely the citron (Citrus medica), the shaddock or pomelo (C. maxima) and the mandarin (C. reticulata). Oranges, lemons and grapefruit are hybrids between these 3 wild species. And botanists have also concluded that the cumquats, hitherto separated into the genus Fortunella, do not differ in any essential way from Citrus and must therefore be included in it. The same goes for the Australasian species hitherto included in Microcitrus and Eremocitrus. Highly ornamental, the citrus family crops longer than any other fruit tree and their dark glossy foliage holds its attractive appearance throughout the year. The fragrant, white, star-shaped flowers appear singly or in clusters at different times of the year, depending on the variety. The fruit structure is unique and is what identifies the genus. The tough skin, dotted with numerous tiny oil-filled cavities, encloses a white ?pith? of greatly varying thickness, within which the characteristic segments are contained. Each segment is packed with juice-filled vesicles which develop from hairs lining the walls of the flower?s ovary, each hair consisting of a single cell.

Specie Vernacular Zone
Citrus 3 aurantiifolia 11?12
Citrus 3 aurantium 9?11
Citrus 3 bergamia 9?11
Citrus 3 jambhiri 9?12
Citrus 3 limon 9?11
Citrus 3 limonia 10-12
Citrus 3 microcarpa 9-11
Citrus australasica 10?11
Citrus glauca 9?12
Citrus hystrix 10?12
Citrus ichangensis 8-10
Citrus japonica 9?10
Citrus latifolia 10?12
Citrus limetta 10?12
Citrus maxima 10?12
Citrus medica 9?11
Citrus reticulata 9?11
trifoliata



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