What does involucre mean?
An involucre is a botanical structure consisting of a whorl or ring of leaflike bracts around a flower or flower head. The bracts can protect the developing flower and make the surrounding structure conspicuous, as in the green bracts beneath the yellow flower head of a daisy. In compound flowers, such as those of the daisy family, the involucre surrounds the entire group of small florets rather than each individual floret. The word belongs to specialized formal botanical vocabulary but is useful when distinguishing the supportive or protective bracts around a flower head from structures such as the calyx, which surrounds a single flower. Although not everyday language, the involucre is an elegant example of how botanical terminology names the distinctive arrangement of plant parts rather than treating them simply as individual leaves.
nounIn botany, an involucre is a whorl or ring of leaflike bracts surrounding or supporting a flower or flower head.
- A whorl or ring of leaflike bracts surrounding or supporting a flower or flower head.
"A ring of green bracts forms the involucre beneath the dandelion's flower head."
"The dandelion's flower head is surrounded at its base by an involucre of narrow green bracts."
"The sunflower's showy ray florets frame the central disc, while an involucre of green bracts surrounds the head from below."
The standard plural adds -es to the singular noun.
"Several distinct involucres occur around the flower head."
Beneath a daisy's bright flower head sits a modest ring of green bracts—the flower's protective involucre.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of involucre
The word comes from Latin involucrum, meaning a wrapper or envelope. That form derives from involvere, “to wrap up, enclose, or involve,” the same source of words such as involve, involute, and involution. The botanical sense developed from the word's general meaning of something that wraps or encloses another part.
Related word forms
How involucre is actually used
This is specialized, formal botanical terminology. It is especially associated with flowers in the daisy family and should not be confused with the calyx, which surrounds an individual flower rather than an entire flower head.
Easily confused with involucre
An involucre is a ring of bracts around a flower head, whereas an involute describes a structure curled inward.