The International Organization of Plant Biosystematists was founded in 1960 to promote international cooperation
in the study of biosystematics. Traditionally, biosystematics applies methods beyond comparative morphology to analyze taxon
boundaries and taxon relationships. Most research covers the range from population biology to the taxonomic levels of genus
and family. Besides experimentation with the living plants to determine crossing relationships, character stability or
plasticity, and the genetics of character differences, there is an emphasis on cytology for the investigation of ploidy and
hybridization, the chemistry of secondary compounds and molecular marker systems from isoenzymes to comparative genomic
sequencing.
IOPB publishes a newsletter, and organizes an international symposium every three years.
The Newsletter presents profiles of biosystematics laboratories, publishes a list of chromosome number data
and introduces groups working on plant molecular sytematics.