Silene nutans, commonly known as Nottingham Catchfly, is a diploid perennial found throughout Europe and in some parts of the northeastern United States. The common name comes from the fact that this flower used to cover the outer walls of Nottingham Castle in England (think Robin Hood!), despite the absence of the species on the castle today. S. nutans exhibits a very interesting blooming pattern:  its flowers open at night and different floral organs open on successive nights. The first night, it opens one whorl of stamens so pollen can be dispersed via nighttime pollinators such as moths. The second night, a second whorl of stamens open. And on the third night, when the stamens have mostly wilted, it exposes three styles to receive pollen. It is thought that this sequential blooming pattern emerged to ensure outcrossing within the species and reduce inbreeding.  --Evan Brown