The Collaborative International Dictionary of English v.0.48:

Poinciana \Poin`ci*a"na\, n. [NL. Named after M. de Poinci, a
   governor of the French West Indies.] (Bot.)
   A prickly tropical shrub (C[ae]salpinia, formerly Poinciana,
   pulcherrima), with bipinnate leaves, and racemes of showy
   orange-red flowers with long crimson filaments.
   [1913 Webster]

   Note: The genus Poinciana is kept up for three trees of
         Eastern Africa, the Mascarene Islands, and India.
         [1913 Webster]

WordNet (r) 3.0 (2006):

Poinciana
    n 1: small subgenus of ornamental tropical shrubs or trees; not
         recognized in some classifications [syn: Poinciana,
         subgenus Poinciana]
    2: a tropical flowering shrub having bright orange or red
       flowers; sometimes placed in genus Poinciana [syn: bird of
       paradise, poinciana, Caesalpinia gilliesii, Poinciana
       gilliesii]

U.S. Gazetteer Places (2000):

Poinciana, FL -- U.S. Census Designated Place in Florida
   Population (2000):    13647
   Housing Units (2000): 4590
   Land area (2000):     35.105724 sq. miles (90.923403 sq. km)
   Water area (2000):    0.237734 sq. miles (0.615729 sq. km)
   Total area (2000):    35.343458 sq. miles (91.539132 sq. km)
   FIPS code:            57900
   Located within:       Florida (FL), FIPS 12
   Location:             28.155768 N, 81.476502 W
   ZIP Codes (1990):     34759
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Poinciana, FL
    Poinciana