The Collaborative International Dictionary of English v.0.48:

jewels-of-opar \jewels-of-opar\ n.
   An erect plant (Talinum paniculatum) with tuberous roots
   and terminal panicles of red to yellow flowers, grwing from
   Southwestern North America to Central America; it has been
   widely introduced elsewhere.

   Syn: Talinum paniculatum.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

jewels-of-opar
    n 1: erect plant with tuberous roots and terminal panicles of
         red to yellow flowers; southwestern North America to
         Central America; widely introduced elsewhere [syn: jewels-
         of-opar, Talinum paniculatum]