Species and genera that are genetically close are characterized by similar series of hereditary variability with such accuracy that, knowing a number of forms within one species, one can foresee the finding of parallel forms in other species and genera. The closer the genera and species are genetically located in the general system, the more complete the similarity in the series of their variability. Entire families of plants are generally characterized by a certain cycle of variation, passing through all the genera and species that make up the family.
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