Bract Involucral bracts
Bracts that appear in a whorl subtending an inflorescence are collectively called an 'involucre'. An involucre is a common feature beneath the inflorescences of many Apiaceae, Asteraceae, Dipsacaceae and Polygonaceae. Each flower in an inflorescence may have its own whorl of bracts, in this case called an 'involucel'. In this case they may be called 'chaff', 'paleas', or 'receptacular bracts' and are usually minute scales or bristles. Many asteraceous plants have bracts at the base of each inflorescence.