This section carries out the ecological studies on Nepalese flora. Nepal is rich and unique in biodiversity due to diverse physiographic and climatic conditions. Altitudinal variation ranges from 60 m to 8848 m asl. This range affect in climatic conditions and ultimately to biological diversity of its areas. Nepal is a suitable spot to study the relationship between altitudinal gradient and plant diversity. Therefore, varied climatic zones became the centre for biodiversity study and research.