Looks like a Syngonium to me, not a Philodendron.

Agreed!

Hi
Would have to agree with the others due to the sharp division of the leaves rather than more lobed appearance of panduriforme. Syngoniums come in a gazillion forms and to make it even more complicated leave forms change as they mature as well as change color lol
good luck with it !! syngonium gets my vote as the worlds most obnoxious weed lol gary

Thanks. How is it an obnoxious weed?

Once you've got it you've got it for good. When you try to pull it out bits break off, roots, stems, and they form new plants and they're off again. If you throw the plants away anywhere they take off again. The only effective way to get rid of them is freezing, or burning them.

The previous owner let them take over the place and I had a huge job trying to clear some areas out. Years later there's still plants coming up. Some areas I left to them, so they're right up high in the trees. At the moment it's a stalemate, they're not gaining any ground, and I'm not managing to reduce them any further.

Hi
IME it will grow in dirt,sand water ashalt cement,trees ,rain gutters will even push house siding apart and come in the house .Will suffocate anything allowed to climb on and almost impossible to remove .I collect over 3 bushels a week and you don't dare compost them lol They go to the city landfill . I'd call that a "weed" ?? lol gary/

So now it looks as if I can add syngonium to onion weed and wandering Jew as the stars of my garden. No wonder the previous owners sold up and moved far away!