So in cases like that, what we do is this:
Using the example of Hibiscus, we would remove the main parent plant entry to Hibiscus.
Then we would create a parent plant entry for:
1) Hibiscus mocheutos
2) H. syriacus
3) H. rosa-sinensis
And we would not have a main generic Hibiscus parent plant.
But the benefit is that we get much more specific with our parent plant feature, but when specificity isn't necessary we can cover entire genera by simply excluding the species field in the parent plant.
