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!
Having two rows of branches, lobes, leaflets, or veins arranged on either side of a common axis. The word "pinnate" means "like a feather", which might help you to visualize its structure/architecture.