Mystery plant

[Jim McKenney]

I've already circulated the images in question on several lists, and so far no one has come up with an answer. I think the plant is growing in a Virginia garden. I have not seen it myself; these pictures are all the information I have.

[Jim McKenney]

Oops! Here's another image which might help.

[Maggi Young]

I thought at first I recognised this plant - not that my poor remaining brain cells could recall a name then - but now I see the size/scale of the leaf I am thrown back into confusion.   My first thought was that there is a resemblance to Pachysandra terminalis- but  with more rounded leaves - but the full pic of the leaf  belies that connection, I fear.

[Jupiter]

I'm pretty sure I've walked past it in Adelaide Botanic Gardens hundreds of times but I can't for the life of me drag the name out of my muddled mind. I should be heading in there soon but I hope someone solves it for you before then.

[fermi de Sousa]

The leaf looks like an Akebia on steroids!
cheers
fermi

[Jupiter]

THis has been bugging me so I got on Google and hit the trail. I think I've narrowed it down to a member of the Araliaceae, some of the Neopanax are similar. Here the trail goes cold. I think Ivy family is right though, what do you think?

[Jim McKenney]

Yes, Jupiter, it does have an araliaceous look, and some members of the genus Pseudopanax come close. But all the ones I've seen have a serrated edge to the leaf and/or a pointed tip to the leaf.  It also has a vitaceous look, but again all of the near matches have the serrated leaf edge and/or a pointed tip. 
I tried hard to make it an Akebia, but that so far has not worked either.
Please keep trying everyone!

[Jupiter]

Hi Jim, yes I was on the Vitaceae trail for a while but abandoned that due to the veining on the leaflets.

[Maggi Young]

Don't think the leaves are right for Akebia, nor Parthenocissus, which could also have palmate leaves  - but anyway , these are climbers - this shows no sign of climbing at all as far as I can see 

[arisaema]

I'll bump this as I'm still stumped - and curious!