The USA-NPN website will be temporarily unavailable for scheduled maintenance beginning late Sunday, July 26 through early Monday, July 27 (EDT). 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!
An individual bract under a flower head of a plant, within the involucre, such as occurs especially in, but not exclusively, the Asteraceae plant family - in daisies, dandelions, sunflowers, thistles, asters, etc.