Hi, kinknstein,
If you are interested with this species, I can show you some of my collection later. Then you will find how huge differece in this variety.
P. aphrodite and P. amabilis are different, but they are really hard to identify, unless you have checked hunderds of these variants.
According to the research, P aphrodite was the ancester of this group in Luzon, Philippines, Millions years ago one of this brach develop up to the north, and became the P. aphrodite var. formosa. the other down to the south became the P. amabilis.
The name of these variants has been a long history of argument among the botanists. That is a intersting issue to study.