01415naa a2200229 a 450000100080000000500110000800800410001910000180006024500900007826000090016852008350017765000120101265000130102465000200103765000130105765000140107065300130108465300150109765300120111270000190112477300420114316491582000-07-14       1973    bl ---       0--  u    #d1 aROGERS, D. J.  aA monograph of manihot esculenta with an explanation of the taximetrics methods used.  c1973  aAs an economic botanist, the senior author has long felt that one of the basic needs for the improvement of plants useful to man is a knowledge of the kinds of variation that are found within a species, or group of species, and how these variations relate to one another. Recognizing the complexities and problems involved in meeting such needs, we began development of the necessary tools and procedures in 1952. Rather than attack the problem from a general standpoint, it seemed more reasonable to start with one crop (Manihot esculenta Crantz = manioc, cassava, yuca or tapioca) and use that as a model to solve problems in other crops. Having been trained as taxonomists, we naturally describe the problem as one of classification wherein the variations within the species are classified on the basis of the gross morphology.  acassava  ataxonomy  aIdentificação  aMandioca  aTaxonomia  aCultivar  aCultivares  aSpecies1 aFLEMING, H. S.  tEconomic Botanygv.27, p.1-113, 1973.