Photo courtesy of AmiRoses
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[From A Celebration of Roses, p. 89:] Rosenlexikon, originally prepared in 1936, published 1960 in the German Democratic Republic and reprinted in 1983 by Gustav Weiland of Lübeck... lists some 18,000 roses, and a large number of them are remontant hybrids, or, as we know them, hybrid perpetuals...
In the Rosenlexikon, fragrance and growth of roses are rated from 1 to 10. We show this as 1/10 to 10/10.