This is one of those cases where there are two hostas with the same name. One is registered (shown above) and, therefore, the "official" version of H. 'Yuma' while the other is a non-registered plant and needs to be renamed before introduction into the nursery trade.

The 'Yuma' pictured above is the one introduced by Van Wade of Wade and Gatton Nursery (Closed 2019) of Ohio from Ohio. It is a hybrid of H. 'Something Old' × H. 'Woodland Blue' which Van registered in 2007. It forms a large size mound that is 21 inches tall by 48 inches wide. The blue-green foliage is round, cupped and heavily corrugated. White flowers bloom from late June into July.

Hosta Helper will call this plant 'Yuma' (Wade)

Ron Livingston of Michigan originated this plant of unidentified parentage. It is a medium size plant about 22 inches high with a spread of around 45 inches with light green foliage. The leaves are narrowly ovate and wavy. It bears purple flowers.

Hosta Helper will call this plant 'Yuma' (Livingston)