1. Small bracts or leaf-like structures that form a secondary involucre beneath the flowers or flower clusters in certain plants, especially in the carrot and parsley families.
Usage: botanical term; plural of involuccel

Examples

• The involucels of the wild carrot are finely divided and feathery.
• Botanists examined the involucels to help identify the plant species.
• The involucels in this umbel are more prominent than in related species.
• Under the microscope, the involucels showed distinctive characteristics.
• The presence of involucels is an important diagnostic feature in plant taxonomy.