WordNet (r) 3.0 (2006):

ringworm shrub
    n 1: tropical shrub (especially of Americas) having yellow
         flowers and large leaves whose juice is used as a cure for
         ringworm and poisonous bites; sometimes placed in genus
         Cassia [syn: ringworm bush, ringworm shrub, ringworm
         cassia, Senna alata, Cassia alata]