The Collaborative International Dictionary of English v.0.48:

beggar-ticks \beggar-ticks\ n.
   1. the seed of bur marigolds.

   Syn: spanish needles.
        [WordNet 1.5]

   2. any of several plants of the genus Bidens having yellow
      flowers and pricky fruits that cling to fur and clothing;
      -- also called beggar's-ticks.

   Syn: bur marigold, burr marigold, beggar's-ticks, sticktight.
        [WordNet 1.5]