The importance of plant is not hidden from anyone. No doubt plants are divine gift to us. Green medicines are now more popular than the synthetic ones because of having the potential to cure a large number of diseases with a strong belief that herbal medicines are with less side effects, safe and easily availability. The present book consists of two important medicinal plants Jacaranda mimosifolia and Allamanda cathartica, which have antioxidant potential and various biological activities. Jacaranda mimosifilia belongs to Bignoniaceae family commonly known as the Trumpet Creeper, Jacaranda, blue Jacaranda, Black Poui, the Fern Tree, and Tarco, Bignonia or the Catalpa family that consist of about 120 genera and about 800 species. It has many bioactive constituents and diverse pharmacological activities such as cardiovascular, cytotoxic, antimicrobial, antioxidant, wound healing, hypotensive and many others. Allamanda cathartica L. belongs to apocynaceae family commonly recognized as Dogbane or Oleander family that consist of about 200 genera and 2,000 species. It is also therapeutically very important plant because of its numerous bioactive chemical constituents.