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Aims to present global checklists of selected families of seed plants. Each number will encompass one or more families and include: all known published and accepted species and infraspecific taxa; known synonyms, both under accepted names and in separate lexica; world distribution; life-forms; pertinent nomenclatural and other comments; selected, annotated references for each genus as well as the family as a whole, principal infrafamilial taxa, and major world regions; generic commentaries covering world distribution, special features, uses, classification and relationships; commonly accepted position of each genus in the family; number of recorded species in each genus; and summaries of insufficiently known and excluded taxa.