Cattleya Confusion? Need some help

[Djarum Black]

I am having some problems nailing down species and hybrid characteristics of some of my Catts.

Here is what I do not understand. If anyone can help explain this, I would be so happy.

I have read from several sources that C. walkeriana is a bifoliate, but that it has only one leaf. I thought bifoliate meant two leaves? And what of walkerianas that have both one and two leaves on the same plant. Is it possible that it is a hybrid? Maybe with a nobilor? I have read it is an anomaly in the species, but I see it so often that it has left me very confused. In fact, several of my walkeriana's are showing the two-leaf trait. Is it a fluke or what?

Ok, now my second major confusion that I cannot sort out.
What is the difference between C. Dolosa and C. Heathii? Both seem to be made with the same parents (loddigesii and walkeriana), and yet often bare those two different names. Are these two hybrid names interchangeable at the moment?

It is driving me crazy because no source I can find has the same information on either of these subjects.