I crossbred capensis wide and 'Albino', capensis wide and intermedia 'Cuba', and intermedia 'Cuba' and dielsiana. All the seeds are viable and have germinated. I will not know if the cross really took until they develope some size. I can say that the last cross is not germinating like the other two. The seedlings are slow to develope and much thickier than those of the other two crosses.
Oh, this mad scientist stuff is so exciting.