bract


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Related to bract: epicalyx

bract

a specialized leaf, usually smaller than the foliage leaves, with a single flower or inflorescence growing in its axil
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Bract

 

a leaf in whose axil the flower develops; a leaf enveloping a flower shoot. Bracts are smaller than ordinary leaves and are reduced. Only in a few plants, such as sage, are they large and colorful. Sometimes, for example, in Cruciferae and dill, the bracts fall early.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

bract

[brakt]
(botany)
A modified leaf associated with plant reproductive structures.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
bihai bracts, to categorize their functional relationships, and to determine if there is a specific relationship between the species and the phytotelma environment (wild and cultivated plants).
We confirm Abbe's (1935, 1938) observations that there are one primary bract and one to three flowers in each staminate or pistillate cyme in all genera and sections of the family.
(Poinsettia "flowers" are botanically bracts that surround the true flowers.) The range of varieties is still limited more are in the works but already they are available in both soft and vivid pinks, the latter with a neon glow.
The photosynthetic pigment including chlorophyll a (Ch a), chlorophyll b (Ch b) and carotenoid (Cr) in the bract were determined according to the method by Wellburn (1994).
Multicategoric characters were: (1) primary head shape: round, elliptical, oval, triangular and large transverse elliptical; (2) head tip shape: pointed, round, flat and depressed; (3) external bracts tip shape: pointed, flat and emarginated; (4) external color of the bracts: green, violet-striped green, green-striped violet, mainly violet and totally violet; and (5) anthocyanic pigmentation of the petiole: absent, mild, partial, strong and very strong.
The surface areas of leaves and bracts were measured using a leaf area meter (LI-3000C, Li-Cor, USA).
The most useful character to discriminate among these species corresponds to the fasciculate placement of racemes and their size, although the size and shape of bracts, sepals and petals are also essential for their accurate identification.
Peduncle bracts 2, similar to the leaves (in shape), but 1-nerved (exceptionally 3-nerved) and without foliose apex, 2.5-3.5 x 1.2-1.4 mm.
The control treatment and the treatments stored at 12 and 19[degrees]C for two, four, six and eight days did not lead to an alteration in bract color of the inflorescences, as indicated by the [L.sup.*], [a.sup.*] and [b.sup.*] colorimetric variables (Table 4).