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!
The area on the outside of a grass leaf where the leaf blade meets the leaf sheath. Each grass species has specific characteristics for the leaf collar that can help with identification.