autonymy hierarchy

[Joseph E. Laferriere]

The discussion on autonymy hierarchy raises a related albeit slightly
different point. My question is that if the publication of an infraspecific
name automatically causes the creation of an autonym of the same rank and
priority, which one has priority? For example, suppose I publish the name
Planta hypothetica var. alba in 1997. This automatically causes the
creation of the variety Planta hypothetica var. hypothetica. Suppose in
1998 someone desides that the entire species should be considered a
variety of Planta rubra. Does this become Planta rubra var. hypothetica
or Planta rubra var. alba?