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Use "umbels" in a sentence
"I love to put the flower heads, called umbels, in summer bouquets."
"Botanists call umbels promiscuous, for they are pollinated by a variety of insects."
"On roadside banks, overlooking the eucalyptus groves and polytunnels of market gardens at Boetheric and Burraton, daffodils faded before the end of March and now sprawl between the umbels of alexander."