Monographs-
Monograph is a comprehensive treatment of a
taxonomic group, generally a genus or a family.
Monographs covers morphological and taxonomic
information available worldwide.
By considering a worldwide geographical scope
of a particular species, subspecies, varieties and formas, it is impossible to
discuss a taxon.
An ideal monographic work consists of
exhaustive review of literature, all information related to nomenclature, designated
types, keys, exhaustive description, fully synonymy and citation of specimens
examined.
The preparation of monograph involves vast
disciplines to be undertaken.
It takes several years of patience for the
study to be completed.
In present day due to such difficulties few
monographs are available. E.g. The Genus Datura
(1959) by A.F. Blakslee; The Genus Iris
(1913) by W.R. Dykes; Genus Avena by
B.R. Baum (1977).
Revisions-
It is generally less comprehensive than the
monograph study.
It is based only on the herbarium studies.
It incorporates less introductory materials
and requires the literature review.
It includes complete synonymy, short
description and diagnostic characters.
All over the world the numbers of revisions
is more than 1000.
At present a specific literature on
cultivated plants, wild plants, shrubs, trees and grasses is available.
In renowned herbarium and museum the
published information is available in serial publications, periodicals
(Journals), bulletins, magazines, etc.
In
this way the herbaria and museum also act as a store house of actual specimens,
both in 
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