Involucre

In general, an involucre is a covering. It may refer to:

in flowering plants: an involucral bract, or a pair, whorl or other collection of such bracts, surrounding an inflorescence, particularly in:
- Asteraceae (Compositae)
- Apiaceae (Umbelliferae)
- Euphorbiaceae
- Proteaceae
in some fungi: the involucrum, peridium or Volva
in Marchantiophyta (liverworts), a short tube surrounding one or more antheridia or archegonia or a developing sporophyte
in the fern family Hymenophyllaceae: the cup-shaped indusium surrounding a cluster of sporangia
in the Fagaceae: a term sometimes misused for the cupule surrounding developing nuts (e.g., the cap of an acorn)

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