Quechua people Quinine, which is found naturally in bark of cinchona tree, is known to be used by Quechuas people for malaria-like symptoms. When chewed, coca acts as a mild stimulant and suppresses hunger, thirst, pain, and fatigue; it is also used to alleviate altitude sickness. Coca leaves are the raw material from which cocaine, one of Peru's most historically important exports, is chemically extracted. Many indigenous women wear the colorful traditional costume, complete with bowler style hat. The hat has been worn by Quechua and Aymara women since the 1920s, when it was brought to the country by British railway workers.
Bark (botany) growth which heals over the wound rapidly, but leaves a clear scar, whilst others such as oaks do not produce an extensive callus repair. Frost crack and sun scald are examples of damage found on tree bark which trees can repair to a degree, depending on the severity. Bark (botany) Bark is the outermost layers of stems and roots of woody plants. Plants with bark include trees, woody vines, and shrubs. Bark refers to all the tissues outside the vascular cambium and is a nontechnical term. It overlays the wood and consists of the inner bark and the outer bark.