capitulum capitulum /kəˈpɪtʃʊləm/

noun

1. An arrangement of leafy branches forming the top or head of a tree  ( capitulum )
   an arrangement of leafy branches forming the top or head of a tree
   
2. Fruiting spike of a cereal plant especially corn  ( capitulum , ear , spike )
   fruiting spike of a cereal plant especially corn
   
   
3. A dense cluster of flowers or foliage  ( capitulum , head )
   a dense cluster of flowers or foliage
    A head of cauliflower
   a head of cauliflower
    A head of lettuce
   a head of lettuce