Ectypa plantarum ratisbonensium :
Regensburg :Verfertiget und verlegt von Johann Mayr ... und gedruckt mit Zeitlerischen Schriften,1787-1793.
biodiversitylibrary.org/page/59790799
Smithsonian Institution, Richard A. Howard Photograph Collection
USDA PLANTS images
Howard, R.A. Provided by Smithsonian Institution, Richard A. Howard Photograph Collection. United States, New York, Nassau Co., Planting Fields Arboretum.
Smithsonian Institution, Richard A. Howard Photograph Collection
USDA PLANTS images
Howard, R.A. Provided by Smithsonian Institution, Richard A. Howard Photograph Collection. United States, New York, Nassau Co., Planting Fields Arboretum.