Munronia pinnata (Wall.) Theob. (Meliaceae) is a therapeutically important medicinal plant species used for a series of ailments and hence, it has become a very expensive dry herb in traditional medicine in Sri Lanka. Present study describes island wide distribution,their habitats,areas with higher diversity, flowering and fruiting performances and conservation measures, systematic identification, brine shrimp toxicity and antimalarial activity of M. pinnata. Present survey describes sixteen different morphotypes, their habitats, geographical distribution, areas with higher diversity, flowering and fruiting performances and conservation measures for 16 morphotypes of M. pinnata. Further, it describes morphological, anatomical, micro molecule and macromolecule profiles, Phenol & flavonoids contents and their relationship with brine shrimp toxicity and antimalarial activity of different morphotypes of M. pinnata.