Bruce,
Your plant looks like one of the legendary McColley Philodendron hybrids. In addition to the named/patented hybrids that came out of Mr. McColley's work, a great many unnamed or "mongrel' hybrids were also released to the trade. I know because I worked at Bamboo Jungle (McColley's nursery) and saw what they had, what they were doing, and what they were releasing. i also had the opportunity to look over all the seedling trays.
So without a provenance for your plant (provenance is the origin, or what would be analogous to a "chain of custody", showing the ultimate origin of the specimen), it is very difficult to determine if it is one of the named hybrids or one of the "mongrels". Not to worry, though, because the plant certainly doesn't mind and if you like your plant and enjoy it, that is the most important thing. You might try letting it go up a large totem or tree and see what happens.
