Genus: Celtis - Hackberry print
- Cellular forms
- Domain: Eukaryota
- Kingdom: Plantae
- Subkingdom: Embryophyta
- Division: Angiospermae or Magnoliophyta
- Class: Dicotyledoneae
- Family: Celtidaceae
- Genus: Celtis
- Species: Celtis australis - European nettle tree
- Species: Celtis bungeana - Bunge's hackberry +
- Species: Celtis caucasica
- Species: Celtis planchoniana
- Species: Celtis sinensis - Chinese hackberry +
- Species: Celtis tournefortii - Oriental hackberry