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bract    
n. 苞葉,苞

苞葉,苞

bract
n 1: a modified leaf or leaflike part just below and protecting
an inflorescence

Bract \Bract\, n. [See {Bractea}.] (Bot.)
(a) A leaf, usually smaller than the true leaves of a plant,
from the axil of which a flower stalk arises.
(b) Any modified leaf, or scale, on a flower stalk or at the
base of a flower.
[1913 Webster]

Note: Bracts are often inconspicuous, but sometimes large and
showy, or highly colored, as in many cactaceous plants.
The spathes of aroid plants are conspicuous forms of
bracts.
[1913 Webster]

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