The terms ‘nectar window’ and ‘fenestration’ are used interchangeably for enlarged gaps on the adaxial side of the stamen sheath or tube. The fenestrations facilitate access to the nectaries by a pollinator.
Source: wiktionary
Fenestration
Synonyms for "fenestration"
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traits unique to Darlingtonia include the presence of transparent light-transmitting fenestrations, ...
Source: wiktionary