Why do some Cannas that look the same have different names?
In the absence of a Canna Society or registry for hybridizers, many Canna cultivars have been claimed, renamed, and even patented by nurseries or companies that had nothing to do with developing that cultivar.
Some Canna are also very generous with producing "sports,"which are mutations that can be propagated and sold as a new variety. The classic example is Canna 'Yellow King Humbert', which has produced many new all purple foliage plants with red flowers. The same sport may occur spontaneously at different nurseries and each might claim it as a new introduction and give it their own name. This causes a lot of confusion for Canna enthusiasts!