Complex sentence: The lanceolate leaves that gradually taper to a point are unique to the genus and the floral morphology is most similar to "O. alismatophylla", but the two species differ in the shape of sepals and petals and the proportions of the labellum.
Split into simpler sentences: The lanceolate leaves, which gradually taper to a point, are unique to the genus and the floral morphology is most similar to "O. alismatophylla". However, the two species differ in the shape of sepals and petals and in the proportions of the labellum.