Coreopsis purpurea Cosmos uhdeanus Cosmos purpureus var. purpureus Cosmos purpureus var. typicus Cosmos purpureus var. bicolor Cosmos purpureus var. flavidiscus Bidens purpurea Bidens purpurea var. purpurea Bidens purpurea var. glabriuscula
World Flora Online, http://www.worldfloraonline.org/, accessed June 20, 2024