What is "spigelia"

Spigelia is a genus of flowering plants in the family Loganiaceae. It contains around 60 species, distributed over the warmer parts of the Americas, from the latitude of Buenos Aires to the Southern United States. It was named after Adriaan van den Spiegel (Adrianus Spigelius) by Carl Linnaeus in his 1753 Species Plantarum; the type species is Spigelia anthelmia. Pinkroot is a common name for plants in this genus.