Tepal
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A tepal is one of the outer parts of a flower. The term is used when these parts cannot easily be classified as either sepals or petals. This may be because the parts of the perianth are undifferentia
A Lilium flower showing the six tepals: the outer three are sepals and the inner three are petals.
Flowers of Magnolia × alba showing tepals in various stages of development
Tepals of Magnolia × wieseneri
A hellebore flower showing the petaloid sepals
Sepal
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A sepal is a part of the flower of angiosperms. Usually green, sepals typically function as protection for the flower in bud, and often as support for the petals when in bloom. Collectively, the sepal
Tepal
…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 sepals or petals. This may be because the parts of the perianth are undifferentiated (i.e., of very similar appearance), as in Magnolia, or because, although…
Tetramerous flower of Ludwigia octovalvis showing petals and sepals
After blooming, the sepals of Hibiscus sabdariffa expand into an edible accessory fruit.
In many Fabaceae flowers, a calyx tube surrounds the petals.
The large calyx of the medlar fruit is the source of its vulgar nicknames.