Contents: Introduction,Phytogeography of the Indian subcontinent,Population differentiation,Ecology of mangroves,Ecology of arid and semi arid zones in India. The first volume includes a survey of the phytogeography followed by a review which brings out the problems of population differentiation among Indian flora.Two other papers review the work on mangrove habitats,and the arid and semi-arid regions of the subcontinent.