Pinkster flower

from The Collaborative International Dictionary of English v.0.48

Pinkster \Pink"ster\, n. [D. pinkster, pinksteren, fr. Gr. ?.
   See {Pentecost}.]
   Whitsuntide. [Written also {pingster} and {pinxter}.]
   [1913 Webster]

   {Pinkster flower} (Bot.), the rosy flower of the {Azalea
      nudiflora}; also, the shrub itself; -- called also
      {Pinxter blomachee} by the New York descendants of the
      Dutch settlers.
      [1913 Webster]