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umbel: A flower cluster in which the flowers all rise on stalks from the same point on the plant’s stem, e.g. on a carrot or polyanthus. Recognizing umbel structures can aid in identifying beneficial or harmful plants on the farm, helping with crop management.

umbellifer: A plant belonging to the Umbelliferae. Plants like umbellifers can attract beneficial insects and improve farm biodiversity, enhancing pest control and pollination services.