| 单词 | partial involucre |
| 释义 | > as lemmaspartial involucre 2. Botany. A whorl or rosette of bracts surrounding an inflorescence, or at the base of an umbel. Also: (a) (in ferns) sometimes applied to the indusium; (b) (in liverworts) a sheath of tissue surrounding the female sexual organs; (c) (in fungi) the velum. partial involucre = involucel n. See also involucrum n. 2. ΘΚΠ the world > plants > part of plant > reproductive part(s) > flower or part containing reproductive organs > inflorescence or collective flower > [noun] > involucre fence1727 involucrum1753 involucel1765 involucre1787 involucret1793 cupule1830 1787 T. Martyn tr. J. J. Rousseau Lett. Elements Bot. (ed. 2) v. 54 This set of small leaves or folioles is called the involucre. 1801 Asiatic Ann. Reg. 1800 Misc. Tracts 165/1 Flowers..in umbells..Involucre many leaved, the leaves toothed. 1845 J. Lindley School Bot. (1858) i. 11 When many bracts are collected in a whorl round several flowers they form an involucre. 1861 A. Pratt Flowering Plants & Ferns Great Brit. VI. 146 The indusium.. in some few of our native species, as in the Filmy Ferns,..is cup-shaped,..it is then often called an involucre. 1875 A. W. Bennett & W. T. T. Dyer tr. J. von Sachs Text-bk. Bot. 303 The surrounding tissue of the thallus divides repeatedly and grows into an involucre which is arched upwards and through which the elongating sporogonium afterwards pushes its way. 1875 A. W. Bennett & W. T. T. Dyer tr. J. von Sachs Text-bk. Bot. 306. partial involucre partial involucre n. Botany the involucre of a partial umbel; an involucel. ΚΠ 1813 J. M. Good et al. Pantologia Partial umbel, in botany; otherwise called umbellule... The involucre at the foot of this is called the partial involucre. 1976 P. Bell & D. Coombe tr. Strasburger's Textbk. Bot. (new ed.) 707 The inflorescence is nearly always a compound umbel.., its bracts forming an involucre and partial involucres. < as lemmas |
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