Professor Judd was a contributor to the
Angiosperm Phylogeny Group (APG) and produced his own modification of this in 1999, the
Judd system. The Judd system was revolutionary and allowed for finer methods of classifying angiosperms. The APG is composed of researchers who research and revise APG classification and have released four revisions consecutively. The Judd system was introduced in APG I (1998) and would pave the way for further developments of the following APGs. APG I was an essential collaboration effort between researchers and was managed based on communication. APG II (2003) and APG III (2009) differed from their original. APG II was centered on the “bracketed” system and APG III was centered on the opposite and its focus was not as narrow as its predecessor. However, Christenhusz et al (2015) wrote that family circumscriptions and the impact of DNA-based classification was affecting the APGs. While APG IV lacks focus on extinct groups of angiosperm, it does include a diverse mix of angiosperm that dates from the fossil record. About eight phylogeny families are included in APG IV with a diversity of 295,000 plants. In 2001, Peter F. Stevens, a member of the APG published the “Angiosperm Phylogeny Website”, which still receives updates. It was last updated on June 6, 2025, and is an extensive resource for angiosperm classification and includes citations from Judd’s work. The website interlinks systematics and phylogeny, two essential principles in the study of angiosperm classification. Phylogeny allows researchers to push the limits of systematics to warrant further developments of evolution and diversification. ==Awards==