I saw this plant in the Climatron of the Missouri Botanical Garden. I couldn't find any identifying sign. The petiole has interesting ruffled margins. Can anyone help with ID?

My first thought was maybe Philodendron (Philodendron plowmanii) but the leaves aren't right for that one. We don't have any database photos of Philodendron ernestii but googling for images looks like that one might be a contender. I'm just not all that familiar with Aroids but I bet @Gina1960 might be able to help.

That really does look like Philodendron ernestii to me.

There are 2 forms of P. ernsetii. One is green, and one has red undersides on the leaves.
Its really hard to tell if this is P. ernestii. The ruffled petiole looks like it, but the leaf may not. If the leaf was able to be seen head on and not from this angle, it might be more telling. Ernest has rather elongated leaves.
There is a possibility that this could also be P. alatiundulatum

Thanks for your responses. I looked at images of both P ernestii and P alatiundulatum - I think the latter looks closest. I ran across an astonishing PDF of a lecture from Missouri Botanical Garden with way more info than I needed - but a picture of P alatiundulatum almost exactly half-way through the presentation which looks very much like my plant. Here's a link if anyone is interested.
https://www.missouribotanicalg...

If you'd like to own either plant they are for sale at Ecuagenera. Although the alatiundatum they have is an 'aff' so possibly not the real deal. They have both forms of ernestii. I've been considering the purchase is the red form of ernestii for a while. But I truthfully don't really have space for another climbing philodendron