Species and genera that are genetically close are characterized by similar series of hereditary variation with such correctness that, knowing a number of forms within one species, it is possible to predict the presence of parallel forms in other species and genera. The closer the genera and species are genetically located in the general system, the more complete is the similarity in the series of their variability. Entire plant families are generally characterized by a certain cycle of variability, passing through all the genera and species that make up the family.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.