If you have a part of plant. What are the essential parts (leaves, fruits, stem, roots, flowers) for identifying any plant species? What sort of information is required by plant taxonomist from a collector? What is the simple way to prepare herbarium sheet for plant preservation? Are plant pictures enough for a taxonomist to identify any plant material? Is their any legislation which binds a researcher to take help from plant taxonomist for identification and authentication of his/her selected plant?