Of course these are not pond - aquatic plants but they are one of my favorite land plants and many have asked me to grow them.
Brugmansia an exotic, small tropical tree in the Solanaceae family, also commonly called Angel Trumpet. They produces dramatic, pendent trumpet-shaped, fragrant flowers. In the USA they can get up to 12' tall when grown outdoors in the ground. But they adapt well to container culture, where the plants remain a more manageable size (5-6') through pruning and root restriction.
They can be planted in large pots on decks or patios and brought inside for the winter.
To plant them in the ground the nights cannot have frost or very cold nights.