At Risk: The beautiful swamp pink is one of seven hundred species of flowering plants that the U.S. Department of Fish and Wildlife lists as endangered or threatened.

• Autores: Janet Marinelli
• Localización: Natural history, ISSN 0028-0712, Vol. 108, Nº. 4 (MAY), 1999, págs. 64-67
• Idioma: inglés
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