China aster by Pierre-Joseph Redouté (1759–1840). Original from Biodiversity Heritage Library. Digitally… Free Image from public domain license 
Chamomile (Anthemis nobilis) illustration from Medical Botany (1836) by John Stephenson and James Morss Churchill. Free Image from public domain license 
Flowers in a vase (1688-1698) by Johan Teyler (1648-1709). Original from The Rijksmuseum. Digitally enhanced by rawpixel. 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 