Here are my observations. Whether right or wrong it should give a person a general sense of what to expect when buying a plant, sight unseen or out of bloom. In this first picture I have 3 seedlings from the same cross, 'Bear' X self of hookerae in the front row. Granted not bloomed, so the tags could be wrong. In the past I've had blooming hookeraes from OZ in the 90's, they looked like these. Light green with little to no maroon coloring to the undersides. The back row are the volonteanums. Blooming size, grenhouse adapted collected plants. May or may not be from the same pod. A dregee darker green mottling on the surface of the leaves with light to strong maroon on the undersides. A closeup of one seedling, base of hookerae. One could argue underside coloring is variable in both varieties. I for one, have never seen a hookerae with anything close to what volonteanums can have. On the flipside, I've never seen a volonteanum light enough on the top side to be mistaken as a straight hookerae either. volonteanum flower spike can be very, very tall. I don't recall my hookeraes blooming with such heights.