Vol. 4 issued in two parts each with separate t.-p. and pagination.
Vol. 5 is a supplementary vol. and has title: Systema vegetabilium. Editio decima sexta, curante Curtio Sprengel ... volumen v. sistens indicem generum, specierum et synonymorun, auctore Antonio Sprengel ...
Vol. 4 contains also: Tentamen supplementi ad Systematis vegetabilium Linnaeani editionem decimam sextam auctore Antonio Sprengel ... Gottingae, 1823.