A 20th-century system of plant taxonomy, the Judd system (1999-2016) of plant classification was drawn up by the American botanist Walter S. Judd (1951-) and collaborators, partially based on APG schemes.
2016 system
- viridophytes (green plants)
- chlorophytes
 - streptophytes
- streptophyte green algae
 - embryophytes (land plants)
- bryophytes
 - tracheophytes (vascular plants)
- lycophytes
 - euphyllophytes
- monilophytes (ferns)
 - spermatophytes (seed plants)
- gymnosperms
- Cycadales (cycads)
 - Ginkgoales
 - Coniferales (conifers)
 - Gnetales
 
 - angiosperms
- ANA grade
 - Mesangiospermae
- magnoliid clade (Magnoliidae)
 - Ceratophyllales
 - monocots (Monocotyledoneae)
 - eudicots (tricolpates; Eudicotyledoneae)
 
 
 
 - gymnosperms
 
 
 
 
 
 
Bibliography
- Judd, W., Campbell, C., Kellog, E., Stevens, P. (1999). Plant systematics: a phylogenetic approach. Sinauer Associates.
 - Judd, W., Campbell, C., Kellog, E., Stevens, P. (2002). Plant systematics: a phylogenetic approach. 2nd ed. Sinauer Associates.
 - Judd, W., Campbell, C., Kellog, E., Stevens, P., Donoghue, M. (2002). Plant systematics: a phylogenetic approach. 3rd ed. Sinauer Associates. ISBN 0-87893-407-3. Google Books.
 - Judd, W., Campbell, C., Kellog, E., Stevens, P., Donoghue, M. (2016). Plant systematics: a phylogenetic approach. 4th ed. Sinauer Associates. ISBN 978-1-60535-389-0. Sinauer website.
 
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