Numerosas variedades de trigo têm sido introduzidas e estudadas no Instituto Agronômico, a fim de serem selecionadas as mais adaptadas às condições de São Paulo. Estudos morfológicos detalhados foram feitos relativos a 27 variedades que melhor se comportaram, para identificá-las do ponto de vista botânico. Para a realização dêsse trabalho, elaborou-se um quadro de caracteres a serem observados, relativos ao ciclo de vida das variedades e de seus principais caracteres morfológicos. As 27 variedades comerciais estudadas puderam ser classificadas entre 10 das 16 variedades botânicas descritas para a espécie Triticum æstivum L., a saber : ferrugineum, 2 variedades ; erythroleucon, 3 ; erythrospermum, 5; græcum, 5 ; Delfii, 1; velutinum, 1; leucospermum, 1; alborvhrum, 3; lutescens, 1 e albidum, 5 variedades.
Numerous wheat varieties have been yearly introduced in the State of São Paulo by the Division of Genetics of the Instituto Agronomico of Campinas. Among these, twenty-seven varieties have shown, after 3 years' observation, to be the most adapted to the soil and climate conditions of the State of São Paulo. The present paper deals with the botanical study of these 27 varieties in order to determine whether they are distinct among themselves, or whether two or more of these varieties presenting different introduction dates, names, and origin, actually belong to the same variety. In developing this project the authors based their observations upon the scheme of characteristics previously utilized by Horovitz and Clark & Bayles. An artificial key for classification is also proposed, in which the varieties are arranged according to the criteria already employed by Percival. It was verified that the 27 commercial varieties herein described belong to 10 of the known botanical varieties of Triticum sestivum L.