[wikipedia] Range, Habitat: Silene antirrhina is a species of flowering plant in the family Caryophyllaceae known by the common names sleepy silene[1] and sleepy catchfly.[2] It is native to the Americas, where it is widespread throughout North America and parts of South America. It is known in Europe as an introduced species. It can be found in a wide range of habitat types, including disturbed and recently burned areas. It is sometimes weedy. (link added by Mary Ann Machi)

[Wikipedia] Variability in Appearance: Silene antirrhina is quite variable in appearance, its morphology depending on several environmental factors, such as moisture level and available nutrients.[3] In general it is an annual herb growing erect to a maximum height near 80 centimeters (31 in). (link added by Mary Ann Machi)