The deficiency of specialized bibliography had caused great difficulties and changes in
the identification of the species, in the procedures of a Seed Testing Laboratory. Therefore, through the
characteristics of the weed seeds, which occur in the MERCOSUL Countries, were elaborated
morphological descriptions and drawings in order to help the identification of Ipomoea asarifolia, I.
congesta, I. floribunda and I. hirta. The morphological descriptions of the seeds were based mainly on
the colour and pilosity of the seed coat (surface), the size of the hilum area and the outline, which are
very stable characteristics in the genus Ipomea. The shape of the Convolvulaceae seeds vary with the
amount of developed seeds in the fruit and is not a very consistent characteristic