Supplement:
Coffee tree, a perennial evergreen shrub or small tree of Rubiaceae, is a horticultural perennial cash crop with the characteristics of fast growth, high yield, high value and wide market. Wild coffee trees can grow to 5 to 1 meters high, but coffee trees planted in the manor are often cut to a height below 2 meters in order to increase the fruit yield and facilitate harvesting. The opposite leaves of coffee tree are oblong and smooth, with long branches at the end and few branches, while the flowers are white and open at the joint of petiole and branches.