The dorsal sepal length is a useful identifying characteristic. C. sanctigeorgianus resembles C. hypogaeus in flower and leaf shape and may be distinguished by its dorsal sepal that extends beyond its labellum; it also differs in its straight ovary and predominantly white labellum (excluding the margins). From C. trilobus, it may also be distinguished by its dorsal sepal length, as well as the white, rather than translucent green, labellum.
