In 1991, the comprehensive book
W. George Schmid, was published. It was the
first intensively researched book about the entire genus which,
until that time, suffered from a lot of misinformation and name
confusion. As the result of his research, Schmid determined
that several of the plants previously treated as separate,
species were, in fact, cultivated varieties, i.e. cultivars.
created by nurseries or hybridizers.
This is one of
the hosta groupings that was shifted from species to cultivar status.
For more on this process