The Collaborative International Dictionary of English v.0.48:

stick-tight \stick"-tight`\, n. (Bot.)
   1. any of several plants having seeds tipped with barbs that
      may cling to fur or clothing, especially those of the
      genus Bidens, also called bur marigold,
      beggar-ticks, and Beggar's ticks, which have prickly
      flattened achenes. --RHUD
      [1913 Webster +PJC]

   2. a seed from a sticktight[1].
      [PJC]

WordNet (r) 3.0 (2006):

sticktight
    n 1: any of several plants of the genus Bidens having yellow
         flowers and prickly fruits that cling to fur and clothing
         [syn: bur marigold, burr marigold, beggar-ticks,
         beggar's-ticks, sticktight]
    2: parasitic on especially the heads of chickens [syn:
       sticktight, sticktight flea, Echidnophaga gallinacea]