Sepal

A sepal is a tepal (a segment) of the calyx of a flower. The calyx is the outer part of the perianth, which comprises the sterile inner and outer tepals that are usually differentiated into petals and sepals. The term tepal is usually applied when the petals and sepals are not differentiated. However, in a "typical" flower the sepals are green and lie under the more conspicuous petals. When the flower is in bud, the sepals enclose and protect the more delicate floral parts within.

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The number of sepals in a flower (called merosity) is indicative of the plant's classification: eudicots having typically four or five sepals and 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 plants. 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 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 stamens.

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Tepal: In a general sense, a tepal is any member or segment of the perianth of a flower, such as a petal or sepal. The perianth comprises the two outer, sterile whorls of a flower, although both whorls are not present in all species. The term tepal is usually used when all segments of a perianth are of sim...

Flower: :For the Second World War corvette class, see (s)....

Petal: :For the petals of chakras, see Petal (chakra)....