I took these photos from my friend's pond yesterday.
The upper two leaves belong to the species of Crinum natans forma crispus, the forth is C.calamistratum, and the rest two are hybrids presumedly.
The Crinium natans floating around in the United States does not have the ruffled leaf edges in your photos. I believe that we also have a Crinium natans 'tortifolia' or something along those lines.
The most common Crinium in the United States is Crinium thaianum.
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