Hello again,
I decided to dig a little further on this subject and found another Brazilian work report, from a different author, also suggesting that Involucrata and calycina are the same species.
Here is one link to this work report that you can find online:
https://www.google.pt/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&uact=8&ved=0ahUKEwjnsKGo-ObOAhXIQBQKHVu7BBkQFgglMAE&url=http%3A%2F%2Frepositorio.unb.br%2Fbitstream%2F10482%2F6568%2F1%2F2010_JairEustaquioQuintinodeFariaJunior.pdf&usg=AFQjCNFdDZbz1-L0Xt03gCtUR7n0l8gY3Q&sig2=mUxZgP0b6ihTMv0nGgXHWg&bvm=bv.131286987,d.d24at page 97 this author wrote:
quote
"Existem dois nomes possíveis para essa especie; E.calycina Cambess seria a forma subarbustiva e arbustiva que ocorre nas formações savanicas do Cerrado, e E.involucrata seria a forma arbórea que ocorre nas formações florestais.
Entretanto, apesar do porte e algumas diferenças, principalmente na folha, não foi possivel separar morfologicamente as duas éspecies.
Acredito que devem se tratar da mesma entidade, mas com adaptações ao ambiente de ocorrência.
No entanto são necessários estudos mais detalhados para que se possa chegar a uma conclusão definitiva."
unquote.
for those "non Portuguese" readers/speakers here is one English translation for these words:
"There are two possible names for this species; E.calycina Cambess would be the sub-shrub and shrub form that occurs in the Cerrado savanna formations, and E.involucrata would be the arboreal form that occurs in forest formations.
However, despite the size and some differences, mainly on the leaves, it was not possible to morphologically separate the two species.
I believe that these should be the same entity, but with adaptations to the environment in which they occur.
However we need more detailed studies so that we can reach a final conclusion."
Moreover, the "excicata" photo presented on page 98, described as one "Eugenia involucrata" branch, collected from one 1,6 meter high bush, on the state of Goiás, for sure corresponds to one of the forms known as E. calycina.
Not only the state of Goiás is almost 100% Cerrado area, but also the "1,6 meter high bush" are good clues pointing to E. calycina.