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| − | [[image:Petal-sepal.jpg|right|300px|thumb|Tetramerous flower of the Primrose [[Onagraceae|Willowherb]] (''Ludwigia octovalvis'') showing petals and sepals]] | + | [[Image:Upload.png|thumb|[[Special:Upload|Upload image!]]]] |
| | + | One of the separate [[leaves]] of a [[calyx]].{{SCH}} |
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| − | A '''sepal''' is a part of the flower of angiosperms or flower plants. Sepals in a "typical" flower are green and lie under the more conspicuous petals. As a collective unit the sepals are called the '''''[[Wiktionary:calyx|calyx]]''''' of a [[flower]]. The '''''perianth''''' is made up of the calyx, which is the outer part of the flower made up of sepals and the inner part of the perianth (called the corolla) which is made up of petals.
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| − | The ''[[petal]]s'' and ''sepals'' are usually differentiated into colorful petals and green sepals. But many flowers have colorful sepals and lack petals or the sepals and petals look similar and are often called '''''tepals'''''. The term '''[[tepal]]''' is usually applied when the petals and sepals are not differentiated and look similar or the petals are absent and the sepals are colorful. When the flower is in bud, the sepals enclose and protect the more delicate floral parts within. Morphologically they are modified leaves.
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| − | The number of sepals in a flower (called '''''[[tepal|merosity]]''''') is indicative of the plant's classification: [[eudicots]] having typically four or five sepals and [[monocotyledon|monocots]] and [[palaeodicots]] having three, or some multiple of three, sepals.
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| − | There exists considerable variation in form of the sepals among the [[flowering plant]]s. Often the sepals are much reduced, appearing somewhat awn-like, or as scales, teeth, or ridges. Examples of flowers with much reduced perianths are found among the [[Poaceae|grasses]]. In some flowers, the sepals are fused towards the base, forming a '''calyx tube'''. This ''floral tube'' can include the petals and the attachment point of the [[stamen]]s.
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| − | [[Category: Plant morphology]]
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Latest revision as of 21:09, 16 April 2009
