I believe that there are many types of vallis kicking around out there. Annoyingly, one of the best ways to identify it is from where it came from as most plant growers only use a limited selection as it gives them a range of straight, twisted, big and small without making it too complicated. If I remember correctly Tropica, one of the big European suppliers, use 6 different types to get the selection.
Otherwise yes, that's a twisted vallis and spiralis is straight (unless the leaves get very long), I'm fairly certain that the spiralis refers to the coiled flower stem that it can produce, but don't quote me on that.