A Risan daffodil is a flower that originates from Risa. They differed from daffodils on Earth in that they were lavender in color and had feathery petals.
In 2373, Nog kicked one of Boothby's Risan daffodils on the Starfleet Academy campus and was immediately sorry he had done so. Boothby saw the petals were nearly about to wilt and that the stem was not broken. (DS9 short story: "Best Tools Available")