Multi-volume work

Frey, W. 2009-. Syllabus of Plant Families / A. Engler's Syllabus der Pflanzenfamilien. 13th ed. Gebrüder Borntraeger.

Parts

1. Frey, W. (ed.), 2009. 3 Bryophytes and seedless Vascular Plants: I-X, 1-419.
2. Frey, W. (ed.), 2022. 5/1 Magnoliopsida (Angiosperms) p.p. Subclass Magnoliidae p.p.: Lilianae p.p. (Arecales to Zingiberales), Ceratophyllanae. Subclass Rosidae p.p. (Ranunculanae to Berberidopsidanae): [I]-XII, [1]-671.