Basil is a highly regarded plant; its name is derived from a Latin word for royalty. Basil is an annual herb that is native to tropical Asia and Africa. It is used to clear the head and relieve intellectual fatigue. It can be used for nervous disorders, especially those associated with weakness, indecision or hysteria. Basil's antispasmodic property is said to have a beneficial action on the respiratory system. It is used for the relief of sinus congestion, asthma, bronchitis, influenza and whooping cough.