The Collaborative International Dictionary of English v.0.48:

Scabious \Sca"bi*ous\, n. [Cf. F. scabieuse. See Scabious, a.]
   (Bot.)
   Any plant of the genus Scabiosa, several of the species of
   which are common in Europe. They resemble the Compositae,
   and have similar heads of flowers, but the anthers are not
   connected.
   [1913 Webster]

   Sweet scabious.
   (a) Mourning bride.
   (b) A daisylike plant (Erigeron annuus) having a stout
       branching stem.
       [1913 Webster]

WordNet (r) 3.0 (2006):

Erigeron annuus
    n 1: widely naturalized white-flowered North American herb [syn:
         daisy fleabane, Erigeron annuus]