cup plant(redirected from silphium perfoliatum l.)
Also found in: Encyclopedia.
A perennial herb (Silphium perfoliatum) in the composite family, native to central and eastern North America and having showy yellow flower heads and opposite leaves whose bases fuse to form a cup around the stem.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.