Ecosystem: the complex of a biological community and its environment functioning as an ecological unit in nature. with exchange of matter and energy amongst members of the community and with the environment. 

      Epidermis: the outer layer of tissues. 

      Elliptic: broader in the middle with narrowed ends. 

      Ellipsoid: an elliptical solid body. 

      Emarginate: deeply notched at the apex. 

      Embryo: the incipient new plant within the seed. 

      Endocarp: the inner layer of the wall of a fruit. 

      Ensiform: sword-shaped. 

      Epipetalous: situated on the petals or corolla. 

      Episepalous: situated on the sepals or opposite to the sepals. 

      Exerted: protrudng above, usually of stamens in the corolla-tube. 

      Exfoliate: devoid of leaves, usually of branches.