Definition of involucre in English:

involucre

Syllabification: in·vo·lu·cre
Pronunciation: /ˈinvəˌlo͞okər
 
/
(also involucrum /-krəm/)

noun

Botany
A whorl or rosette of bracts surrounding an inflorescence (especially a capitulum) or at the base of an umbel.
More example sentences
  • The cupules are simple involucres of bracts which are spirally arranged (according to a Fibonacci pattern) on the floral axis preceding the flower.
  • Basal leaves and flowers initiate from a tuberous rhizome and three green cauline leaves arranged in a whorl form an involucre around the developing flower.
  • The Hermaphrodite cyathium shows the characteristics measured (length and width of the cyathium involucre and the nectary).

Origin

late 16th century: from French, or from Latin involucrum, from involvere 'roll in, envelop' (see involve).

Derivatives

involucral

Pronunciation: /ˌinvəˈlo͞okrəl/
adjective
More example sentences
  • In addition to flowers, intense signals were also obtained in young involucral bracts.
  • Note that the outer involucral bracts on the bud are at right angles, a characteristic of southern dandelions.
  • Bright orange-colored involucral bracts and golden yellow to darker orange-colored disc florets. 4.

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