Jack-in-the-pulpit: Pollination by Deception
Posted in Around the Garden, Science on June 12 2013, by Carol Gracie
After spending nearly three decades at the NYBG, and working much of that time in South American rainforests with her husband, Scott A. Mori, Carol Gracie has returned to one of her first botanical interests–local wildflowers. She is the author of Spring Wildflowers of the Northeast: A Natural History and coauthor (with Steve Clemants) of Wildflowers in the Field and Forest: A Field Guide to the Northeastern United States.
One of our easiest to recognize wildflowers is Jack-in-the-pulpit (Arisaema triphyllum). Named for its fancied resemblance to a preacher (“Jack”) in his over-hanging pulpit, the name captures the imagination and makes the plant easy to remember. Like other members of the aroid family (Araceae) the inflorescence is comprised of two parts: a spadix that bears numerous small flowers and a modified leaf called a spathe that surrounds and partially encloses the spadix. In the case of Jack-in-the-pulpit, each plant bears either male or female flowers; the plants are dioecious.
Other aroids can have different arrangements of their flowers; for example the flowers of skunk cabbage (Symplocarpus foetidus) are perfect, meaning that every flower has both male and female parts, while those of the European wildflower known as lords and ladies (Arum maculatum), are arranged with separate male flowers on the upper part of the spadix and female flowers on the lower part.