The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
plural noun (used with a sing. or pl. verb)
A perennial plant (Helenium hoopesii) of western North America, having large, rayed, yellow flower heads clustered in loose corymbs.