epiphyllum

from WordNet (r) 3.0 (2006)

epiphyllum
    n 1: any cactus of the genus Epiphyllum having flattened jointed
         irregularly branching stems and showy tubular flowers [syn:
         {epiphyllum}, {orchid cactus}]

from The Collaborative International Dictionary of English v.0.48

Epiphyllum \Ep`i*phyl"lum\, n. [NL.] (Bot.)
   A genus of cactaceous plants having flattened, jointed stems,
   and petals united in a tube. The flowers are very showy, and
   several species are in cultivation. Epiphyseal