achenes

n.small dry indehiscent fruit with the seed distinct from the fruit wall

1. The sunflower produces achenes, which are commonly referred to as its seeds.
   向日葵产生瘦果，通常被称为它的种子。
2. Many small birds feed on the achenes of various plants.
   许多小鸟以各种植物的瘦果为食。