Coffee bean

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For the chain of coffeehouses, see The Coffee Bean & Tea Leaf.

Structure of coffee berry and beans: 1: center cut 2:bean (endosperm) 3: silver skin (testa, epidermis), 4: parchment (hull, endocarp) 5: pectin layer 6: pulp (mesocarp) 7: outer skin (pericarp, exocarp)

A coffee bean is the seed of the coffee plant (the pit inside the red or purple fruit). The fruits, coffee cherries or coffee berries, most commonly contain two stones with their flat sides together. Coffee beans consist mostly of endosperm that contains 0.8 - 2.5 % caffeine, which is one of the main reasons the plants are cultivated. Coffee beans are an important export product for some countries.

[edit] Etymology

The name derives from the Arabic language (قهوة qahwa - "coffee" and bunn - "berry"). The name bean is not botanically accurate. Coffee is the seed of a fruit not a vegetable.

Image:Coffee beans on tree.jpg

Coffee cherries on coffee plant (Coffea arabica).

[edit] Types

Species of coffee plant include Coffea arabica, Coffea benghalensis, Coffea canephora, Coffea congensis, Coffea excelsa, Coffea gallienii, Coffea bonnieri, Coffea mogeneti, Coffea liberica, and Coffea stenophylla. The seeds of different species produce coffee with slightly different characteristics.

Coffea arabica accounts for about 75% of the world's coffee trade, while Coffea canephora (syn. Coffea robusta) is cultivated where Coffea arabica does not thrive, and Coffea liberica and Coffea excelsa are grown in limited areas.^{[citation needed]}

In a crop of coffee, a small percentage of cherries contain a single bean, instead of the usual two. This is called a peaberry.