A series of monographs in plant systematics, from the International Association for Plant Taxonomy Título BPH: Regnum Veg. Existencias: 1953-1954 v. 1-5; 1956 v. 7; 1957-1958 v. 9-13; 1959-- 1960 v. 16-19; 1961 v. 21-22; 1962-1964 v. 25-33; 1964 v. 36-41; 1966--1968 v. 43-58; 1969 v. 60, 62-65; 1970 v. 69, 71; 1971 v. 79; 1972 v. 84, 86; 1973-1974 v.90-91; 1976 v. 93-94; 1977 v. 96; 1979 v. 98; 1979-1986 v.100-115; 1988-2000 v. 117-137; 2000 v. 138; 2007 v. 147-148; 2008 v. 149-