Figure 1

A flowering plant of Andrographis paniculata (A), Flower of Andrographis paniculata (B). A flowering plant of Hedyotis corymbosa (C), A twig of Hedyotis corymbosa showing the arrangement of flowers. Andrographis paniculata is an herb, usually 30–90 cm in height and commonly found in plains all over India, China and other subtropical countries in South East Asia. Hedyotis corymbosa is a small herb, 5–30 cm long, distributed through out India and other subtropical countries. Both of these plants can grow between 25 to 40°C temperatures and at any soil texture.