1. Distinguished by its columnar fastigiate shape and erect branches
   - Lombardy poplar

Type of: black poplar, Populus nigra

• diacid
• diaconal
• diaconate
• diacritic
• diacritical
• diacritical mark
• diadelphous
• diadem
• Diadophis
• diadromous
• diaeresis
• diagenesis
• Diaghilev
• diaglyph
• diagnosable
• diagnose
• diagnosing
• diagnosis
• diagnostic
• diagnostic assay
• diagnostic procedure
• diagnostic program
• diagnostic technique
• diagnostic test
• diagnostician