The grapefruit's a subtropical citrus tree grown for its bitter fruit, which was originally named the "forbidden fruit" of Barbados. These evergreen trees are usually found at around 5-6 m (16-19 feet) tall, although they can reach 13-15 m (43-49 feet). The leaves are dark green, long (up to 150 mm, or 6 inches) and thin. It produces 5 cm (2-inch) white four-petaled flowers. The fruit's yellow-orange skinned and largely oblate, and ranges in diameter from 10-15 cm. The flesh's segmented and aci… (More on Grapefruit)