Clove : Flower bud :: Cinnamon : ? Complete the analogy.

The relation is a spice : the part of the plant that the spice actually is. A clove is a flower bud picked before it opens and then dried; cinnamon is the inner bark of the tree, peeled off and rolled into quills as it dries. Every distractor is the source of some other spice, which is what makes them inviting — the seed gives cumin and mustard, the leaf gives the bay leaf, and a root gives liquorice.