Who has Svend Poulsen's book on Roses? Is there more info on 'Hybrida' than mentioned in the reference on HMF? Also looking for sources of the attribution of this rose to Valdemar Petersen of Denmark.
I got a repeat blooming op seedling from Hybrida (or a Rosa helenae strain presumed to be that), so Hybrida must be be hybrid with at least one repeat-flowering parent.