Bract
In
Variants
Some bracts are brightly coloured and serve the function of attracting pollinators, either together with the
In grasses, each floret (flower) is enclosed in a pair of papery bracts, called the lemma (lower bract) and palea (upper bract), while each spikelet (group of florets) has a further pair of bracts at its base called glumes. These bracts form the chaff removed from cereal grain during threshing and winnowing.[4]
Bats may detect acoustic signals from dish-shaped bracts such as those of Marcgravia evenia.[5]
A prophyll is a leaf-like structure, such as a bracteole, subtending (extending under) a single flower or pedicel. The term can also mean the lower bract on a peduncle.
The frequently showy pair of bracts of Euphorbia species in subgenus Lacanthis are the cyathophylls.
Bracts subtend the cone scales in the seed cones of many conifers, and in some cases, such as Pseudotsuga, they extend beyond the cone scales.
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Bright yellow bracts of Castilleja levisecta are more tightly pressed against the stem than bracts of other Castilleja species.
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Bracts of Bougainvillea glabra, differ in colour from the non-bract leaves, and attract pollinators.
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Bracts along a banana flower stalk surround the rows of flowers
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Euphorbia milii var. vulcanii cyathia bearing a pair of pinkish cyathophylls.
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Colourful bracts ofAnanas bracteatus.
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The many green involucral bracts of Erigeron peregrinus are linear, loose, taper to a point, about the same length, and help to distinguish this species.
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Dogwood species Cornus floridainflorescence showing four large white bracts and central flower cluster.
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Cornus florida dogwood cultivar with pink bracts surrounding small flower cluster.
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The red bracts of Aechmea bracteata.
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The pink bracts of Curcuma petiolata.
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The pink bract of a new cultivar: Anthurium andraeanum 'Pink Lady'.
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The inflorescence of Alpinia zerumbet protected by two bracts before flower bloom.
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The golden bracts of Musella lasiocarpa.
Bracteole
A small bract is called a bracteole or bractlet. Technically this is any bract that arises on a pedicel instead of subtending it.
Involucral bracts
Bracts that appear in a whorl subtending an inflorescence are collectively called an involucre. An involucre is a common feature beneath the inflorescences of many Apiaceae, Asteraceae, Dipsacaceae and Polygonaceae. Each flower in an inflorescence may have its own whorl of bracts, in this case called an involucel. In this case they may be called chaff, paleas, or receptacular bracts and are usually minute scales or bristles. Many asteraceous plants have bracts at the base of each inflorescence.[6]
The term involucre is also used for a highly conspicuous bract or bract pair at the base of an inflorescence. In the family
Epicalyx
An epicalyx, which forms an additional whorl around the
Spathe
A spathe is a large bract or pair of bracts forming a sheath to enclose the flower cluster of such plants as
See also
References
- ^ "the definition of bracteate". Dictionary.com. Archived from the original on 2017-04-28. Retrieved 2017-04-27.
- ^ "Definition of Ebractate". www.greengonzo.com. Archived from the original on 2017-04-28. Retrieved 2017-04-27.
- ^ Environment Southwest. San Diego Society of Natural History. 1986.
- ISBN 978-0-534-00092-9.
- S2CID 5035286.
- ^ .
- ^ Darpan, Pratiyogita (June 2006). Competition Science Vision. Pratiyogita Darpan. p. 136.
- ^ "Botany" (PDF). Archived from the original (PDF) on 2010-12-14. Retrieved 2010-08-15.
- ^ "epicalyx – Dictionary of botany". Botanydictionary.org. Archived from the original on 2012-05-01. Retrieved 2012-04-29.
- ^ Richard Lynch The Book of the Iris, p. 203, at Google Books
- ^ Alex Casha Flora of the Maltese Islands, p. 287, at Google Books