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Involucre

A series of bracts that subtends an inflorescence. Among species in the composite family (Asteraceae), a series of bracts that subtends a flower head.
 

Figure A.  Involucre of wavy-leaved aster.
(Symphyotrichum undulatum)

 

Figure B.  Involucre of oxtongue.
(Picris hieracioides)

 

Figure C.  Involucre of common teasel.
(Dipsacus fullonum)

 

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