The correct option is C Flora, Manual, Monograph
Flora, manuals, monographs and catalogues are some other means of recording descriptions. They also help in correct identification.
Flora contains the actual account of habitat and distribution of plants of a given area. These provide the index to the plant species found in a particular area.
Manuals are useful in providing information for identification of names of species found in an area.
Monographs contain information on any one taxon.