1. Tall annual marsh elder common in moist rich soil in central North America that can cause contact dermatitis; produces much pollen that is a major cause of hay fever
   - burweed marsh elder, false ragweed

Type of: iva, marsh elder

• Clematis versicolor
• Clematis verticillaris
• Clematis viorna
• Clematis virginiana
• Clematis vitalba
• Clemence Sophia Harned Lozier
• Clemenceau
• clemency
• Clemens
• clement
• Clement Attlee
• Clement III
• Clement Philibert Leo Delibes
• Clement Richard Attlee
• Clement VII
• Clement XI
• Clement XIV
• clementine
• clementine tree
• clench
• clenched
• clenched fist
• cleome
• Cleome hassleriana
• Cleome pinnata