it's probably Epidendrum oerstedii.
parkinsonianum has long, pointed leaves which always hang down.
viviparum usually has the pseudobulbs closer together, and has large bracts which stick out at nearly a right angle to the flowers.
the flower is normal for Epidendrum oerstedii. The two species are very difficult to distinguish just by looking at the flowers.
As I said above, Epi parkinsonianum has long, pointed leaves which hang down. The leaves on parkinsonianum are also much thicker (like succulent leaves), and there's only one leaf on each pseudobulb.
I stand by my original identification.