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“Umbel is formed when the secondary axes originate from the same point on the stem, and rise to nearly the same height. The whole is called a universal umbel. If the secondary axes develop tertiary ones in the same manner, each is called a partial umbel."—Darby, 1855


Darby, John Botany of the Southern States (New York, NY: A.S. Barnes & CO., 1855)


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