This definition appears very rarely
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Samples in periodicals archive:
The new settlers brought with them the famed Loyalist Rose that was registered with the International Registration Authority for roses.
Not only has the Buffy Sainte-Marie rose been commended wherever it has been tested and registered with the American Rose Society, which serves as the International Registration Authority for Roses, it also won the award for Best Floribunda Bloom at the Annual Seattle Rose Show held last June 13.
4) In 1976, about two hundred years after the King's Royal Regiment of New York was first formed, she registered "The Loyalist Rose" with the International Registration Authority for Roses.