Hello Im new here and I would like to know

Whats the diference between canna x generalis, yellow king humbert, and canna flacida?

What cannas are tall 5 feet or more, that have a yellow flower and no red specks?

Or is there a canna that the flower is ONLY yellow?

Between the cannas that have a yellow flower are they hibrids?

Is there a hybrid between the canna tropicana and any other yellow canna?