In addition to coconut and some iris, others are:
palm
mango
apple
lotus
water lily
water mint
willow
silver birch
foxglove
harebell
sea bean
brooklime
(I'm sure there are many more.)
There is a cute little plant in the Okefenokee Swamp. It's called Ladies' Hatpin (an Eriocaulaceae). The seeds float in the ditches and are deposited at the 'high water' mark. When the water recedes, the seeds are in the correct place to thrive.
