Yellow rose by Pierre-Joseph Redouté (1759–1840). Original from Biodiversity Heritage Library. Digitally… Free Image from public domain license 
Hibiscus by Kōno Bairei (1844-1895). Digitally enhanced from our own original 1913 edition of Barei Gakan. Free Image from public domain license 
Rosa hemisphaerica, also known as Yellow Rose of Sulfur (Rosa sulfurea) from Les Roses (1817–1824) by Pierre-Joseph… Free Image from public domain license 
Coreopsis by Frederick Edward Hulme (1841-1909), a vintage chromolithograph of tickseed. Digitally enhanced from our own… Free Image from public domain license 
Colorful field of sunflowers near Beloit. Original image from Carol M. Highsmith’s America, Library of Congress… Free Image from public domain license 
