<P> Wild plants grow between 9 and 12 m (30 and 39 ft) tall, and have an open branching system; the leaves are opposite, simple elliptic - ovate to oblong, 6--12 cm (2.5--4.5 in) long and 4--8 cm (1.5--3 in) broad, glossy dark green . The flowers are white, 10--15 mm in diameter and grow in axillary clusters . The seeds are contained in a drupe (commonly called a "cherry") 10--15 mm in diameter, maturing bright red to purple and typically contains two seeds, the actual coffee beans . </P> <P> Coffea arabica is the only polyploid species of the genus Coffea, as it carries 4 copies of the 11 chromosomes (44 total) instead of the 2 copies of diploid species . Specifically, Coffea arabica is itself the result of a hybridization between the diploids Coffea canephora and Coffea eugenioides, thus making it an allotetraploid, with two copies of two different genomes . </P> <P> Endemic to the mountainous regions of Yemen and the southwestern highlands of Ethiopia . C. arabica is now rare in Ethiopia, while many populations appear to be of mixed native and planted trees . In Ethiopia, where it is called būna, it is commonly used as an understorey shrub . It has also been recovered from the Boma Plateau in South Sudan. C. arabica is also found on Mount Marsabit in northern Kenya, but it is unclear whether this is a truly native or naturalised occurrence . The species is widely naturalised in areas outside its native land, in many parts of Africa, Latin America, Southeast Asia, China, and assorted islands in the Caribbean and in the Pacific . </P> <P> The conservation of the genetic variation of C. arabica relies on conserving healthy populations of wild coffee in the Afromontane rainforests of Ethiopia . Genetic research has shown coffee cultivation is threatening the genetic integrity of wild coffee because it exposes wild genotypes to cultivars . Nearly all of the coffee that has been cultivated over the past few centuries originated with just a handful of wild plants from Ethiopia, and today the coffee growing on plantations around the world contains less than 1% of the diversity contained in the wild in Ethiopia alone . </P>

Where did the arabica coffee plant originated from
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