The Collaborative International Dictionary of English v.0.48:

maravilla \maravilla\ n.
   1. A wildflower (Mirabilis multiflora) having vibrant deep
      pink tubular evening-blooming flowers; found in sandy and
      desert areas from Southern California to Southern Colorado
      and into Mexico.

   Syn: desert four o'clock, Colorado four o'clock, Mirabilis
        multiflora.
        [WordNet 1.5]

   2. A leafy wildflower (Mirabilis longiflora) having
      fragrant slender white or pale pink trumpet-shaped
      flowers; found in the Southwestern US and Northern Mexico.

   Syn: sweet four o'clock, Mirabilis longiflora.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

maravilla
    n 1: wildflower having vibrant deep pink tubular evening-
         blooming flowers; found in sandy and desert areas from
         southern California to southern Colorado and into Mexico
         [syn: desert four o'clock, Colorado four o'clock,
         maravilla, Mirabilis multiflora]
    2: leafy wildflower having fragrant slender white or pale pink
       trumpet-shaped flowers; southwestern United States and
       northern Mexico [syn: sweet four o'clock, maravilla,
       Mirabilis longiflora]