This volume compiles the `state of the art' knowledge on several aspects of ``Biodiversity, Conservation, and Systematics". The International Botanical Community recognizes "that plants create the ecological habitat for all terrestrial organisms, and that their management and conservation depend on a good understanding of their taxonomy". Biodiversity is considered as "an immense economic resource". Its conservation and sustainable use ensures food security, safeguards human health, and provides ecological as well as aesthetic and cultural benefits. Systematics, as a fundamental science, serves as a very important discipline for understanding biodiversity. In this volume, emphasis has been laid on the simplest Prokaryotic organisms, the diverse Algae, the "Adaptive Strategies of Bryophytes and the "Diversity in Pteridophytes". There is stress on the importance of Ethnic Knowledge, Botanic Gardens, and Reproductive Biology in conservation. Interesting aspects of `Invasive Plant Species', `Analysis of Plant Biodiversity and Evolution at Genome Level' and `Leaf Epidermal Diversity in Grasses' are discussed. Detailed accounts of the fauna and flora of Punjab have also been provided. Dr. Prithipalsingh is a Senior Reader in Botany in Kirorimal College. He has been teaching since 1971. The areas of special interest in which he is recognized as an expert include, besides Plant Taxonomy, Biodiversity Studies, Ecology and Environmental Biology. He has published numerous research papers in National and International Journals. Dr. Prithipalsingh served on the National Consultation Committee for discussing the "State of the Environment Report of India 2001" prepared by the United Nations Environment Programme. He has completed a project on "Status of biodiversity conservation in Punjab" for the Punjab Forest Department, as a member of the Tata Energy Research Institute team. As a consultant for Biodiversity with “The Energy Research Institute (TERI)”, Dr. Prithipalsingh participated in several World Bank funded research projects of the Uttar Pradesh/Uttranchal State Forest Department. He has obtained first hand information on the effect of 'fire', 'grazing', 'collection of non-timber forest products' and 'natural regeneration', focusing on the ground realities for evaluating the impact of different parameters necessary for formulating “management recommendations”.