The references are annotated with 'subject areas', mainly to aid searching via computer editors or browser search tools, but assignment of many of the articles is somewhat arbitrary and some appear under more than one heading. Many of the works listed are largely or partly compilations, which themselves list primary data sources: the latter are listed here only when they have been utilized directly.
|A | Major sources of comparative anatomical data, or of background information on anatomical characters and character states |
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|CL | Classification, phylogeny, classificatory methodology |
|CY | Major data sources for cytology, breeding systems |
|E | Major sources for comparative embryology |
|G | Morphological terminology |
|I | Source of illustrations for the database |
|M | Major sources of descriptive morphological and/or phytogeographic data |
|PH | Major sources for comparative biochemistry, phytochemistry, physiology |
|PO | Major sources for pollen structure |
|PP | Photosynthetic pathway data — sources of carbon isotope ratios, carbon dioxide compensation points, and related anatomy. |
|Q | Literary quotations |
|S | Software and relevant background |
|T | Sources of taxonomic and descriptive data of all kinds, pertaining to particular families or to small series of families |