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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.
A Standard Portfolio includes the standard and all the information relevant to the cultivar.
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.
Any abbreviations after the botanical (latin) part of the plant name are the author or authority for the plant name. These are recognised abbreviations of the name of the person who published the name for the species. In the case of many hybrids, there may be no species or hybrid name and therefore no authority. In the example: Magnolia acuminata L. 'Koban Dori' "L.", short for Linnaeus is the authority for Magnolia acuminata. However Magnolia 'Caerhays Belle is a hybrid of uncertain parentage so no specific or hybrid name is used and no authority necessary.
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.
© The Royal Horticultural Society 2011 / RHS Registered Charity № 222879/SC038262