Too difficult to say. many aroids have juvenile leaves like that but the adult leaves are vastly different. If it's a Hoya the leaves should be in pairs (opposite) along the stem. Philos don't have opposite leaves.
This is a young Philodendron erubescens Red Emerald, but you couldn't tell the difference between it and several other juvenile Philos. Or some Epipremnums either. Often you just have to wait for adult foliage.
I will continue to be a lurker on Dave's but all of you should know there is no such thing as a true mini Philodendron. There are two species, one from western Brazil and one from southeastern Colombia that stay relatively small. Both of these are very rare and rarely available to a collector. All the others get big, some really big.
Philodendron are largely climbing species and if allowed to climb will morph into shapes you likely can not imagine due to natural variation. Most growers think of the genus as small trailing species but in truth that is not always factual. There are a few terrestrial species but the majority climb in order to find bright light. Even the terrestrial plants can grow very large with leaves exceeding 4 to 6 feet.
P. wend-imbe appears to be a hybrid of Philodendron wendlandii Schott crossed with Philodendron imbe Schott ex Endl. P, wendlandii is from Nicaragua to Panama while Philodendron imbe is from Bolivia. The plant is a hybrid and not a species since it is not listed on any scientific database. It will still grow larger than you think if given the right conditions and some info indicates blades of 2 to 3 feet or more. There is some confusion over P. imbe that Brazilian botanist Eduardo Gonçalves has written this about. P. imbe may also just be a natural hybrid, "Taxonomically, Philodendron imbe may prove to be a name so deeply embedded in confusion that this name should not be used anymore. Anyhow, at least in Brazil, the material usually called P. imbe is a cultivar with no origin defined that can produce a large quantity of offshoots and it never flowers around here. It has sagittate leaves with clearer nerves and grows so massively that can be used as a dense shrub." I have grown it for many years and if given a tall totem it will change shape and size.
Thanks Rachel. You are a great friend. I just noticed how many edits I made to that post so please forgive me. Once I get going on a research project I keep finding new info so I go back and make edits. I do it all the time to my own website to the point I sometimes confuse myself. I hope I didn't make this one overly difficult to grasp.
See you in April at the Missouri Botanical Garden!
Absolutely never to difficult in any way shape or form Steve. Your wisdom and knowledge concerning the Araceae family of plant's is extremely valuable to us all and I know for sure your website is one tremendous "tool" that many value.
Thank you for helping and guiding me along my way and alway's being there for me when I have a question. You are a tremendous mentor and superb friend and this is one gal who sure does appreciate every thing you do for us all!