Research
Herbarium
Nomenclatural standard specimens and standard portfolios
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A nomenclatural standard is a pressed specimen or illustration prepared and deposited in a recognised herbarium to demonstrate the diagnostic characteristics of a cultivar.
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A Standard Portfolio includes the standard and all the information relevant to the cultivar.
Delphinium 'Ruby Tuesday' - Referred for further assessment (RFA) by the Joint Delphinium Committee at Chelsea Flower Show, 24 May 2004
Name not registered yet.
Searching the database of nomenclatural standards
The database of nomenclatural standards allows you to search for information on specimens of nomenclatural standards. The concept of nomenclatural standards is of very recent introduction, so that for many cultivars, there is no entry. However, this is a rapidly expanding collection and the catalogue is updated frequently.
It is hoped that this site will eventually be linked with organisations elsewhere that also hold nomenclatural standards.
A-Z of Nomenclatural standards (187Kb) – a complete list of nomenclatural standards held in the RHS Herbarium (WSY) as at March 2007.
Scientific and/or cultivar name:
Enter one or more words from the scientific or cultivar name. More help.
More about nomenclatural standards
How to send in a potential Standard
Acknowledgements
This information has been compiled by the Herbarium of the Royal Horticultural Society with assistance from the Database Administrators and the Information Technology Department.
The Standards webpages have been made possible through the work of BG-BASE Inc and the Royal Botanic Garden, Edinburgh.