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 it is possible to distinguish an outer 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".^[1]^[2] (De Candolle used the term perigonium or perigone for the tepals collectively; today, this term is used as a synonym for perianth.)^[3]

^ Augustin Pyramus de Candolle (1827). 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. Paris: Deterville. p. 503.
^ Augustin Pyramus de Candolle (1841). Vegetable organography; or, An analytical description of the organs of plants. Vol. 2. Translated by Boughton Kingdon. London: Houlston & Stoneman. p. 90.
^ Stearn, William Thomas (2004). Botanical Latin (p/b ed.). David & Charles/Timber Press. ISBN 978-0-7153-1643-6. p. 39.

[1] Augustin Pyramus de Candolle (1827). 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. Paris: Deterville. p. 503.

[2] Augustin Pyramus de Candolle (1841). Vegetable organography; or, An analytical description of the organs of plants. Vol. 2. Translated by Boughton Kingdon. London: Houlston & Stoneman. p. 90.

[Stea04-3] Stearn, William Thomas (2004). Botanical Latin (p/b ed.). David & Charles/Timber Press. ISBN 978-0-7153-1643-6. p. 39.

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