umbel
noun
um·bel ˈəm-bəl 
: a racemose inflorescence typical of the carrot family in which the pedicels arise from about the same point to form a flat or rounded flower cluster see inflorescence illustration
Example Sentences
Recent Examples on the Web Come July or early August, the plant is covered by zillions of tiny white flowers arranged in umbrella-like affairs called umbels. 
Paul Cappiello, The Courier-Journal, 17 Apr. 2020 Clumps of Huachuca water umbel, an endangered plant with slender leaves, grow in wetlands by the river — one of more than 600 species of plants found along the San Pedro. AZCentral.com, 5 Dec. 2019 Closer investigation showed them to be black swallowtail butterfly larvae, also known as parsley worms, which feed on the foliage of umbels — plants in the carrot/parsley/dill/fennel family with short flower stalks that spread from a common point. Sally Mccabe, Philly.com, 15 June 2018 Cow parsley got a pass because of its irresistible floating clouds of umbels, but we were instructed to cut its numbers in half. Amy Merrick, WSJ, 26 Apr. 2018 Its white flowers bloom in June or July and form an umbel pattern marked by several small blooms spreading out from a single point. Donna Vickroy, Daily Southtown, 28 July 2017
Paul Cappiello, The Courier-Journal, 17 Apr. 2020 Clumps of Huachuca water umbel, an endangered plant with slender leaves, grow in wetlands by the river — one of more than 600 species of plants found along the San Pedro. AZCentral.com, 5 Dec. 2019 Closer investigation showed them to be black swallowtail butterfly larvae, also known as parsley worms, which feed on the foliage of umbels — plants in the carrot/parsley/dill/fennel family with short flower stalks that spread from a common point. Sally Mccabe, Philly.com, 15 June 2018 Cow parsley got a pass because of its irresistible floating clouds of umbels, but we were instructed to cut its numbers in half. Amy Merrick, WSJ, 26 Apr. 2018 Its white flowers bloom in June or July and form an umbel pattern marked by several small blooms spreading out from a single point. Donna Vickroy, Daily Southtown, 28 July 2017 Word History
Etymology
New Latin umbella, from Latin, umbrella — more at umbrella
First Known Use
1597, in the meaning defined above