Centaurea (Knapweed) is a genus of herb in the family Asteraceae. They are native to Western North America and North America. They have achenes. Individuals can grow to 12 cm.
Definition: a fruit which develops from a carpel or gyneocium and at maturity comprises a dry exocarp, a dry mesocarp, and a dry endocarp that are connected to a seed coat by a funicle
Definition: a fruit which develops from a carpel or gyneocium and at maturity comprises a dry exocarp, a dry mesocarp, and a dry endocarp that are connected to a seed coat by a funicle