Externally-maintained standards

Some early TDWG standards are now maintained by other organizations. This page provides links to those standards.

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The standards listed on this page were ratified as TDWG standards prior to the adoption of the current standards development process in 2006. Although TDWG no longer has any role in maintaining them, TDWG still recommends their use, even though they may not qualify as Current Standards under the present-day documentation and maintenance criteria.

Authors of Plant Names

Authors of Plant Names is maintained as part of of the International Plant Names Index (IPNI).

BPH and BPH/Supplementum

Botanico-Periodicum-Huntianum and Botanico-Periodicum-Huntianum/Supplementum are maintained by the Hunt Institute for Botanical Documentation.


DEscription Language for TAxonomy (DELTA) is maintained by its authors.

Index Herbariorum

Index Herbariorum. Part I: The Herbaria of the World is maintained as an online version by the New York Botanical Gardens.


Taxonomic Literature, Edition 2 and its Supplements (TL-2) is maintained as an online version by the Smithsonian Institution.