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Tepal
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{{Short description|One of the outer parts of a flower}} [[File:Mature flower diagram.svg|thumb|upright=1.4|Diagram showing the parts of a mature flower. In this example the perianth is separated into a calyx (sepals) and corolla (petals)]] A '''tepal''' is one of the outer parts of a [[flower]] (collectively the [[perianth]]). The term is used when these parts cannot easily be classified as either [[sepal]]s or [[petal]]s. This may be because the parts of the perianth are undifferentiated (i.e. of very similar appearance), as in ''[[Magnolia]]'', or because, although it is possible to distinguish an outer [[Whorl (botany)|whorl]] of sepals from an inner whorl of petals, the sepals and petals have similar appearance to one another (as in ''[[Lilium]]''). The term was first proposed by [[Augustin Pyramus de Candolle]] in 1827 and was constructed by [[analogy]] with the terms "petal" and "sepal".<ref>{{cite book|url=https://www.biodiversitylibrary.org/item/60660#page/527/mode/1up|title=Organographie végétale, ou Description raisonnée des organes des plantes; pour servir de suite et de développement a la théorie élémentaire de la botanique, et d'introduction a la physiologie végétale et a la physiologie végétale et a la description des familles|author=Augustin Pyramus de Candolle |year=1827|publisher=Deterville|location=Paris|page=503}}</ref><ref>{{cite book|author=Augustin Pyramus de Candolle|year=1841|title=Vegetable organography; or, An analytical description of the organs of plants|translator=Boughton Kingdon|volume=2|page=90|url=https://www.biodiversitylibrary.org/item/70328#page/104/mode/1up|publisher=Houlston & Stoneman|location=London}}</ref> (De Candolle used the term ''perigonium'' or ''perigone'' for the tepals collectively; today, this term is used as a synonym for ''perianth''.)<ref name=Stea04>{{Cite book |last=Stearn |first=William Thomas |year=2004 |title=Botanical Latin |edition=p/b |publisher=David & Charles/Timber Press |isbn=978-0-7153-1643-6 }} p. 39.</ref>
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