Anubias barteri ‘Broad Leaf’
Nana can get a ton of leaves and get large, I have seen them 1-2 feet in length, but the leaves are smaller.
There is a vine one Dustin from Dustins planted tanks sells, I saw them at a speaking engagement he brought them to. He says they prefer mid to high pH. Why I don't have one.
Are you looking for longest stem, most or biggest leaves?