We harvested the lone pitaya. The other two flowers and their potential fruits withered and fell off the vine. Our fruit wasn't the most flavorful, but my reaction was - it would make a tasty beverage (with sugar, water and ice). It looked good, and let's face it, it is my first pitaya fruit. There is some hopeful news: there are two new blooms getting ready to flower. We shall try again!
I looked it up and sure enough this is what a Mexican tuberose looks like. Mine is secured to a bambu pole to give it the strength to carry on. The plant looks healthy and I am trying to give it my full support. (The wide leaves around the base of the tuberose are a flowering succulent.)