Just back from a trip to Home Depot (for Brits: that's like B&Q only much much bigger).

Naturally, we took a look at the plants and found their hosta labelling in complete chaos  The two hostas in the picture (click it to enlarge) were both labelled 'Albomarginata'. And elsewhere in the display the one on the left was labelled 'Fragrant Bouquet' and the one on the right was labelled 'Golden Tiara'! Even allowing for the fact that all the plants were very soft and had clearly been forced, and for the fact that the foliage of young plants is often not typical of mature specimens - well, it's entirely possible that none of the names are right! 

So go to a specialist for your hostas.

In the interests of balance it's only fair to say that when we stopped later at Home Depot's big competitor, Lowe's, I found the one petunia with two different names. But at least one of them was right.