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!
Whorls of the perianth of a flower in which the sepals/calyx and petals/corolla are undifferentiated - and identical or almost identical in appearance - such as with tulips and lilies and magnolias