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''Coffea'' is a genus of flowering plants whose seeds, called coffee beans, are used to make coffee. It is a member of the family Rubiaceae. They are shrubs or small trees native to tropical and southern Africa and tropical Asia. Coffee ranks as one of the world's most valuable and widely traded commodity crops and is an important export product of several countries, including those in Central and South America, the Caribbean and Africa. ==Cultivation and use== Several species of ''Coffea'' may be grown for the seeds. ''Coffea arabica'' accounts for 75-80 percent of the world's coffee production, while ''Coffea canephora'' accounts for about 20 percent.〔(Arabica and Robusta Coffee Plant ), at the Coffee Research Institute homepage. Retrieved December 2012.〕 The trees produce edible red or purple fruits called "cherries" that look like drupes, but are epigynous berries. The cherries contain two seeds, the so-called "coffee beans", which—despite their name—are not true beans. In about 5-10% of any crop of coffee cherries, only a single bean, rather than the usual two, is found. This is called a peaberry, which is smaller and rounder than a normal coffee bean. It is often removed from the yield and either sold separately (as in New Guinea peaberry), or discarded. When grown in the tropics, coffee is a vigorous bush or small tree that usually grows to a height of . Most commonly cultivated coffee species grow best at high elevations, but do not tolerate freezing temperatures. The tree of ''Coffea arabica'' will grow fruits after three to five years, and will produce for about 50 to 60 years (although up to 100 years is possible). The white flowers are highly scented. The fruit takes about 9 months to ripen. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Coffea」の詳細全文を読む スポンサード リンク
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