The taxonomy; of grain legumes is relatively uncomplicated
compared to that of cereals, brassicas and some other
groups of plants because, in general, only limited gene
pools have been available for selection and subsequent
plant breeding. Then again, intergeneric legume hybrids
are not known in nature and artificial crosses attempting
to create them are seldom, if ever, successful [64].
Indeed, the genetic barriers between species and species
groups are often substantial [86,87]. The classification'
of interfertile species and infraspecific variants is
inherently more difficult and the taxonomic situation in
grain legumes is not exceptional. In some instances the
available information would now seem to justify updating
of the taxonomic framework
