Arethusa

noun

2. In botany, a genus of orchids, consisting of a single species, A. bulbosa, a small swamp-plant of North America, with a handsome rosy-purple sweet-scented flower terminating a sheathed scape.
3. In zoology: A genus of acalephs. A genus of mollusks. Montfort, 1808. A genus of reptiles. Duméril and Bibron, 1840. A genus of crustaceans.
4. Any of several bog orchids, of the genus Arethusa, having a magenta flower; the swamp pink
5. any of several bog orchids of the genus Arethusa having 1 or 2 showy flowers