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Cypripedium Ulla Silkens is a grex of ground orchid of the genus Cypripedium. It results from the cross of C. flavum (seed parent) and C. reginae (pollen parent). The grex was originated by J. Petersen and registered by S. Malmgren in 1996.
References
Cypripedium Ulla Silkens Wikipedia(Text) CC BY-SA