The names of families printed in bold-face italics, arranged in alphabetical sequence within the major groups, are to be retained in all cases, with priority over unlisted synonyms (Art. 14.5) and homonyms (Art. 14.10).
When two listed names compete, the earlier must be retained unless the contrary is indicated or one of the competing names is listed in Art. 18.5. For any family including the type of an alternative family name, one or the other of these alternative names is to be used.
By a decision of the Vienna Congress (2005), the starting-point date (Art. 13.1) for suprageneric names in Sphagnaceae, Hepaticae and Spermatophyta is Jussieuís Genera plantarum (4 Aug 1789). For details of the changes arising from this and other decisions taken in Vienna see the Preface to this Code (p. xiii).


(c) 2006, by International Association for Plant Taxonomy. This page last updated  19.03.2007 .