Carcerulus (pl. carceruli) A type of capsular fruit that breaks up at maturity into one-seeded segments or nutlets. The carcerulus is typical of the Lamiaceae family, e.g. deadnettle (Lamium).

• 小坚果群：一类有蒴的果实，成熟后分裂形成包含一个种子的小坚果。是薄荷类（唇形科）植物的典型特征。