Families and genera of spermatophytes recognized by the Agricultural Research Service - Gunn, Charles R. 1927-; Wiersema, John Harry 1950-; Ritchie, Carole A.; Kirkbride, Joseph Harold 1943- (Beltsville, Maryland : United States, Department of Agriculture, Agricultural Research Service, 1992)
Keywords: FANEROGAMAS -- NOMENCLATURA; BOTÁNICA -- NOMENCLATURA; Estados Unidos -- Agricultural Research Service