I wonder where and when a species name format was first applied to a hybrid. I'll have to watch and wait to see if my paniculatus and wallichi flower together to try to replicate the cross. It's nice to know that this cross appears in the wild.
what has confused me with this naming is
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The flora of S Africa volume 14 mentions Cotyledon dinteri as a synonym for T. wallichi ssp ecklonianus.
How the name got associated with a cross is a mystery.