The Collaborative International Dictionary of English v.0.48:

Marigold \Mar"i*gold\, n. [Mary + gold.] (Bot.)
   A name for several plants with golden yellow blossoms,
   especially the Calendula officinalis (see Calendula), and
   the cultivated species of Tagetes.
   [1913 Webster]

   Note: There are several yellow-flowered plants of different
         genera bearing this name; as, the African marigold or
         French marigold of the genus Tagetes, of which
         several species and many varieties are found in
         gardens. They are mostly strong-smelling herbs from
         South America and Mexico: bur marigold, of the genus
         Bidens; corn marigold, of the genus Chrysanthemum
         (Chrysanthemum segetum, a pest in the cornfields of
         Italy); fig marigold, of the genus
         Mesembryanthemum; marsh marigold, of the genus
         Caltha (Caltha palustris), commonly known in
         America as the cowslip. See Marsh Marigold.
         [1913 Webster]

   Marigold window. (Arch.) See Rose window, under Rose.
      [1913 Webster]

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]

The Collaborative International Dictionary of English v.0.48:

Bur marigold \Bur" mar"i*gold\
   See Beggar's ticks.
   [1913 Webster]

WordNet (r) 3.0 (2006):

bur marigold
    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]