In 1861, Müller classified this species in the subsection Umbellata of the section Planifolia of subgenus Euepidendrum Lindl.

The diploid chromosome number of E. difforme has been determined both as 2n = 40 and as 2n = 39.

[1] Reichenbach, H. G. "Orchides" in Müller, C. Ed.

Walpers Annales Botanices Systematicae 6(1861)402-403.

This Laeliinae-related article is a stub.