Q. Keys for identification of taxonomic work?

Identification is an integral part of all taxonomic work. It is the recognition of certain, characters of flower, fruit, leaf or stem and the application of a name of a plant with those particular characters. Unknown specimens are identified by means of keys. A key is a device for easily identifying an unknown plant by a sequence of choice between two statements. It provides the correct identity of a specimen by a process of elimination. It is more efficient to identify a specimen by the use of keys than to shuffle through a stack of previously named herbarium specimen until a comparison is found.