The RHS is the International Registration Authority for Delphinium.
Registration
Download registration forms here:
Application form to register a Delphinium cultivar name
Publications
The RHS publishes the Delphinium Register Cumulative Supplement 1996. Subsequent annual supplements are published in the Yearbook of the Delphinium Society.
Delphinium registers
Further information
Anon. (1949). A Tentative Check-list of Delphinium Names. London: RHS.
Anon. (1970). Addendum to a Tentative Check-list of Delphinium Names. London: RHS.