I bought this as a small seedling from a local nursery, a cross between Cattleya walkeriana var. alba 'Hirata' x C. walkeriana var. caerulea 'Blue City'. The plant flowered type and a close examination however shows that it is in fact a hidden hybrid with Cattleya nobilior rather than pure C. walkeriana. Unfortunately, this has been common with this species (C. walkeriana) with so many good clones being, actually, hybrids with C. nobilior that are sold as if they were pure C. walkeriana. In this case, the side lobes form and the flower stem arising from a well-formed, leafed pseudo-bulb are more than enough indications of the hybrid nature. What really gets me upset is that you grow a seedling three or four years with all the care only to discover that someone back there fooled you!
Apart the dark side, the flower itself is large and has a deep coloration and is strongly fragrant! Despite that, I gave it to a friend.