AARON'S ROD

Aar″on's rod′ (âr″ŭnz rŏd′). [] 1. 1. (Arch.) A rod with one serpent twined around it, thus differing from the caduceus of Mercury, which has two.
2. 2. (Bot.) A plant with a tall flowering stem; esp. the great mullein, or hag-taper, and the golden-rod.