genus Parthenium ge·nus·part·henium uncommon noun 1. small genus of North American herbs and shrubs with terminal panicles of small ray flowers SynonymsPartheniumgenus Parthenium Related words Broader terms asterid dicot genus Parts Compositae Part of guayulebastard feverfewAmerican feverfew WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
