The Collaborative International Dictionary of English v.0.48:
crazyweed \crazyweed\ n. any of several leguminous plants of Western North America causing locoism in livestock. Syn: locoweed, crazy weed. [WordNet 1.5]WordNet (r) 3.0 (2006):
crazyweed n 1: any of several leguminous plants of western North America causing locoism in livestock [syn: locoweed, crazyweed, crazy weed]