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!
a modified or rudimentary leaf, such as those protecting buds; in the case of conifer cones, a sporophyll (a modified leaf) is often referred to as a scale—onto which the reproductive parts are positioned