Any guesses? First 2 are Primary Hybrids, next 2 are species, last one a Primary Hybrid
One of the first 2 primary hybrids: P. Sayun album; first species: P. venustum fma measuresianum (the albinistic form); second species might be P. haynaldianum.
I might be totally off the rails? But one thing, I for sure can't fathom, is, that you mention 5 plants, but post 6 photos of what seem to be quite different plants?!
Might the sixth photo bring us somewhere within the realm of villosum or thereabout?
PS. It might be helpfull if you in like, future posts, gave each photo a number - and refered to the number, when talking about the individual plants, just to avoid any confusion!