Just to clarify I'm not suggesting it could be a hybrid between species. Just between the two sub-species. It seems to me that's possible with seed-grown plants when, if that article is to be believed, not everyone may know what version they've got.
Of course, yes, it's more likely to be just throwing out the odd second leaf. If it was to flower with more than the usual number of flowers though that would also suggest a hybrid between the two cernua varieties.
Just idle speculation...
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