Umbel

Definition and stakes

Portrait of James Edward Smith James Edward Smith,  An introduction to physiological and systematical botany (1807)

“ Mag. 251, opens its upper, or central, flowers first, contrary to the usual order in its genus; both which instances prove such a diversity to be of small moment.
Umbella, an Umbel, for which some authors retain the obsolete old English name of Rundle. In this several flower-stalks, or rays, nearly equal in length, spread from one common centre, their summits forming a level, convex, or even globose surface, more rarely a concave one. When each ray is simple and single-flowered, it is called a simple umbel, as those of Allium ursinum, Engl. Bot.
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Source: Wikisource

Portrait of Gaston Tissandier Gaston Tissandier,  Popular Scientific Recreations

“ The compound or branching corymb, a corymb in which the secondary axis again sub-divides; example, Pyrus terminalis. 10. The umbel: in this form the primary axis is greatly depressed, and the peduncles arise from a common point, and spread out like radii of nearly equal length, a whorl of bracts (involucre) surrounding the common base. In the compound umbel (fig. 781) , Daucus carota, the secondary axis ends in small umbels surrounded by bracts, which is termed an involucel. This is observable in the umbelliferous plants—carrot, parsley, hemlock, etc. ”
Source: Gutenberg

Asa Gray,  The Manual of the Botany of the Northern United States

“ E. párvulus, Engelm. Scapes 1–3 ́ high; shoots often creeping and proliferous; leaves lanceolate or spatulate, acute (1⁄2–11⁄2 ́ long, including the petiole) ; umbel single, 2–8-flowered; pedicels reflexed in fruit; flower 3 ́ ́ broad; stamens 9; styles much shorter than the ovary; achenes beakless, obtusely few-ribbed.—In mud, Mass. to Mich. and E. Minn., south to Fla. and Tex. (S. Am.)
2. E. rostràtus, Engelm. Scape erect, 3 ́–2° high, longer than the leaves; leaves broadly ovate, cordate or truncate at base, obtuse (the blade 1–3 ́ long) ; umbel proliferous, in a branched panicle
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Source: Gutenberg

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