any of numerous chiefly North American composite perennial herbs (genus Solidago) with small heads of usually yellow late-blooming flowers often clustered in panicles
goldenrod
noun(gold-en-rod)
a shrubby to herbaceous composite plant (Haplopappus heterophyllus synonym Isocoma wrightii) especially of open saline ground from Texas to Arizona and northern Mexico that lacks ray flowers and causes trembles in cattle