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Sepal
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==Morphology== [[Morphology (biology)|Morphologically]], both sepals and petals are modified leaves. The calyx (the sepals) and the corolla (the petals) are the outer sterile whorls of the flower, which together form the ''perianth''.<ref name="Davis1979">{{Cite book |last1=Davis |first1=P.H. |title=The identification of flowering plant families, including a key to those native and cultivated in north temperate regions |last2=Cullen |first2=J. |publisher=Cambridge University Press |year=1979 |isbn=0-521-29359-6 |location=Cambridge |pages=106}}</ref> In some plants, such as ''[[Aristolochia]]'', the calyx is the primary whorl, forming a flower up to {{convert|20|in|cm}} wide, with one sepal growing to a length of {{convert|13|ft|m}} {{ndash}} [[Aristolochia grandiflora]], the largest of all calyces.<ref>{{ cite book | last= Rohwer | first= Jens G. | date= 2002 | title= Tropical Plants of the World | location= New York | publisher= Sterling | page= 208 }}</ref><ref>{{ cite journal | last=Pfeifer | first= HW | date= November 1966 | title= Revision of the North and Central American Species of Aristolochia | journal= Annals of the Missouri Botanical Garden | volume= 53 | issue= 2 | page=164| doi= 10.2307/2394940 | jstor= 2394940 | url= https://www.biodiversitylibrary.org/part/4247 }}</ref>
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