The Collaborative International Dictionary of English v.0.48:

Jewbush \Jew"bush`\, n. (Bot.)
   A euphorbiaceous shrub of the genus Pedilanthus
   (Pedilanthus tithymaloides), found in the West Indies, and
   possessing powerful emetic and drastic qualities.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Jewbush
    n 1: low tropical American shrub having powerful emetic
         properties [syn: Jewbush, Jew-bush, Jew bush,
         redbird cactus, redbird flower, Pedilanthus
         tithymaloides]