I visited Norm Beaudry's awesome garden just northwest of DC in Bethesda, MD. Norm manages the seed exchange for the Amer Rhodo Society and has a TON of Rhodos on his property. Here's a few photos of some of his big leaf Rhodos. I'd like to seem them when they get larger.
Hardy Giant 'R. fortunei x fictolaceum'
Hardy Giant leaf....my hand is 8" (20.3cm) long.
R. maximum x macabeanum
Leaf of R. maximum x macabeanum
Another, read label
Close up of the leaf
A garden shot
another, read label
Close up of leaves
leaf underside....very cool