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Lemongrass, also known as lemongrass, lemongrass, is a fragrant plant. Perennial herb, the whole plant has a lemon flavor, plant height 100-200 centimeters, short stems hidden in the ground, nodes whorled, leaf sheaths embracing the stem glabrous, linear leaves from near the roots, leaf length 60-150 centimeters, about 1 centimeter wide, leaf blade clusters, both sides of the back rough, was white, autumn and winter flowering and fruiting, flowers do not wake up, panicle sparsely, for the majority of the racemes composed of, caryopsis. Native to tropical Asia such as India, Sri Lanka, cultivated in Guangdong, Hainan, Taiwan, widely planted in tropical areas. Mainly used for the extraction of essential oils.

Lemon Rutaceae citrus small tree plants, branches less spiny or nearly unarmed, young leaves and flower buds dark purplish-red, single flowers axillary or few flowers in clusters, calyx cup-shaped, ovary sub-tubular or barrel-shaped, slightly narrow at the top, stigma capitate. Pericarp thick, usually rough, fruit ellipsoid or ovate, juice acid to very acid, flowering in April-May, fruiting in September-November.

Lemon originated in Southeast Asia, India, China and so on, there is no certainty. Brought to Europe by the Arabs, the Mediterranean coast, Southeast Asia and the Americas are distributed. The main producing countries of lemon are China, Italy, Greece, Spain, southern European countries and the United States.

Lemon is used to dissolve phlegm and relieve cough, and to promote the production of body fluid and stomach. It is used for bronchitis, whooping cough, loss of appetite, vitamin C deficiency, heat stroke and thirst.