What's the story with this interesting mamm? I have a regular M. carmenae, and it's a pretty plant with its soft yellow spines. Obviously, this plant has a lot of red in the spines. I've heard about hybrids between M. carmenae and M. lauii. Does the x at the end of the name signify a hybrid of unknown paternal origin? I've never seen an x at the end of a name. Pretty plant though.
The plant came from John Pilbeam and as I was dropping off a plant for pollination this morning I asked him about it. He got the Mamm. in Holland where many carmenae crosses have been undertaken for different colour flowers etc. John believes it is a cross with the brown spined form of laui ssp subducta. As I was leaving he said 'dies more easily than normal carmenae' !