A program, “Wildflowers of the Great Swamp,” will be held April 10 at 1 p.m. at Trinity-Pawling School in Pawling, N.Y.

Carol Gracie, a retired botanist of the New York Botanical Garden, will be the guest speaker at the Gardiner Theater at the school, 700 Route 22.

Gracie is also the co-author of “Wildflowers in the Field and Forest: A Field Guide to the Northeastern United States” and “Spring Wildflowers of the Northeast: A Natural History.”

For more information, visit www.frogs-ny.org.