The Collaborative International Dictionary of English v.0.48:

mahon stock \ma*hon" stock`\ (Bot.)
   An annual cruciferous plant with reddish purple or white
   flowers (Malcolmia maritima). It is called in England
   Virginia stock, but the plant comes from the Mediterranean.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Virginia \Vir*gin"i*a\, n.
   One of the States of the United States of America. -- a. Of
   or pertaining to the State of Virginia.
   [1913 Webster]

   Virginia cowslip (Bot.), the American lungwort (Mertensia
      Virginica).

   Virginia creeper (Bot.), a common ornamental North American
      woody vine (Ampelopsis quinquefolia), climbing
      extensively by means of tendrils; -- called also
      woodbine, and American ivy. [U. S.]

   Virginia fence. See Worm fence, under Fence.

   Virginia nightingale (Zool.), the cardinal bird. See under
      Cardinal.

   Virginia quail (Zool.), the bobwhite.

   Virginia reel, an old English contradance; -- so called in
      the United States. --Bartlett.

   Virginia stock. (Bot.) See Mahon stock.
      [1913 Webster]

WordNet (r) 3.0 (2006):

Virginia stock
    n 1: erect branching herb cultivated for its loose racemes of
         fragrant white or pink or red or lilac flowers; native to
         sands and sea cliffs of southwestern Greece and southern
         Albania [syn: Virginian stock, Virginia stock,
         Malcolmia maritima]