Ludwig Pfleger (1720–1793)
- Studies of the blossoms, fruits and trunk of an English oak (Quercus robur)
- Studies of the leaves, blossoms, fruits and trunk of an English elm (Ulmus procera)
- Studies of the leaves, blossoms, fruits and trunk of a whitebeam (Sorbus subgenus Aria)
- Studies of the trunk, blossoms and fruit of a wild apple tree (Malus sylvestris)