headlet
/ˈhɛdlɪt/noun
A little or miniature head; (Botany ) each of the parts of a flowering plant that together constitute a compound inflorescence; an umbellule.
Origin
Late 16th century; earliest use found in William Harrison (1535–1593), historian and topographer. From head + -let, in botanical use after classical Latin capitulum flower head of a plant.