According to
The Hostapedia by
Mark Zilis
(2009), this plant is "...not considered a legitimate
cultivar; name used for at least two types of hostas, one being
a green-leaved Fortunei
with tall scapes, the other a large
Hosta sieboldiana type; treated as a synonym for Hosta sieboldiana 'Elegans' by
Schmid (1991)...The name H.
fortunei 'Robusta' was used by
Georg Arends in 1905 for the plant that eventually became
Hosta sieboldiana 'Elegans'..."
Seedlings of this cultivar include H. 'Neat
Splash'.
The species (now cultivar) was named for plant explorer
Robert Fortune.