The USA-NPN website will be temporarily unavailable for scheduled maintenance beginning Sunday, July 26, 10:00 PM (EDT) through early Monday, July 27. Thank you for your patience and understanding.
We are undertaking a major revision of our Nature's Notebook data collection app to make it easier and more fun to track plant and animal seasonal activity!
A dry, indeshiscent, one-seeded fruit that has developed from one flower having a single ovary, and the ovary wall becomes rigid at maturity (such as a sunflower "seed" - which is a fruit).