Types of Hostas
Blue Plantain-Lily
Plantain Lily 'Blue Angel', 'Blue Angel' Hosta Among the largest blue-leaved hostas, 'Blue Angel' (Plantain Lily) is an outstanding perennial forming a gracefully cascading mound of thick, heavily textured, widely oval to wedge-shaped, dark blue-gray to blue-green leaves, 16 in. long (40 cm), with prominent veins slightly ribbed.
source:
gardenia.net
image:
americanmeadows.com
Hosta 'Undulata'
Note also that there are some newer hostas on the market ('Fire and Ice,' 'White Christmas,' 'Night Before Christmas') that bear a resemblance to Undulata types, but these grow much more slowly and are not likely to be found as give-away or inherited plants.
source:
delvalhosta.org
image:
gardenia.net