Question
I'm confused about the term "miniature phalaenopsis".  If one is listed as miniature, does that mean the leaf span stays small (4-6", perhaps) and a mature one will live happily in a 3" pot?  or does it mean that the plant is normal sized (leaf spans over 12") and the flowers are tiny? Which species or hybrids have the smallest leaf spans at maturity, that you know of? I love phals, but my space is very limited.  I appreciate your time.

Answer
It's not surprising that you're confused.  I don't think there is agreement, but I think a concensus is that it's the size of the flowers that defines "miniature".  There are very few truly miniature species.  The most common one is Phalaenopsis equestris.  There are hundreds of hybrids that have this species in their background.  Chances are pretty good that any plant with flowers less than 3 inches across has a miniature species in its background.  A nice choice would be a plant with a branching flower spike with many flowers under 2 inches across.  Any phalaenopsis, of course, should be annually repotted in orchid potting mix to keep it healthy.  Mature healthy plants develop extensive root systems which eventually will require a larger pot size.  That also will mean more flowers. If you see that someone is selling "Miniature phalaenopsis" I think they have small flowers, but probably also are small plants.