Canna 'Constitution' is another to have its ancestory in "water cannas."

It was introduced by R.J. Armstrong, of Longwood Gardens, USA, who are well known for developing many "water cannas." Year of introduction ... unknown

C. 'Constitution' can be slow to grow and may even miss a season of flowering, but when it does, it's gorgeous! The rather thin flower stems are full of blooms and often bend (annoyingly!) groundwards with the weight of the blooms.
The leaves emerge a deep bronzey/burgundy green, maturing to a coppery green and are lance-like but not extremely narrow.

Although its history is related to the water cannas, it does have a tendency for the rhizomes to rot when too wet. It well suits garden conditions, just as other garden cannas.
The fertility is unknown, but it does produce seeds, which I have not yet tried, so propagation is best by division.

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