The Carter Center has kindly agreed to subsidize the family Botanical Quiz Prize and has generously donated a lovely centerpiece to Calvin F. Gatch Jr for his correct guess Onoclea sensibilis. The Trustees felt that quibbling (see Comments) about the failure to identify the location was counterproductive. Here is a photo of the prize.
Interior/Exterior Floral Centerpiece. Click for larger view
Many thanks to the Carter Center, and to the many less fortunate that submitted guesses about the Spring Botanical Quiz, “Better luck next time!”