"Gideon Singer" wrote
Is there a web page where the entire orchid family is displayed as a
tree and searchable?

Not that I know of, the closest I can think of is missouri botanical
gardens at http://mobot.mobot.org/W3T/Search/vast.html . You can
search for species there, but not hybrids.
Also tends to give equal weight to synonyms, not updated so you have
to cross reference with Jay Pfahl.

jimwatts