Quercus robur
Illustration by G. Reid. Medical Botany: or Illustrations and descriptions of the medicinal plants. London,  1831.
Cypripedium pubescens
Flore des serres et des jardins de l'Europe. Louis Van Houtte, éditeur.
Balsamorhiza sagittata
Illustration by Mary Vaux Walcott. North American Wild Flowers. Washington, 1925.
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