Several years ago we planted asclepias curassavica in the garden at St. Anne's.
For the first time in my memory, the plants produced many follicles this winter. Asclepias is the milk weed family, and those plants produce their seeds in follicles. Long, banana shaped pods full of seeds just waiting to burst out and float away on the wind. The children loved these seeds and blew several of them up into the air and watched them float away.