Illecebrum verticillatum

from The Collaborative International Dictionary of English v.0.48

Knotwort \Knot"wort`\ (n[o^]t"w[^u]rt`), n. (Bot.)
   A small, herbaceous, trailing plant, of the genus
   {Illecebrum} ({Illecebrum verticillatum}).
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Centinody \Cen*tin"o*dy\, n. [L. centum a hundred + nodus knot:
   cf. F. centinode.] (Bot.)
   A weed with a stem of many joints ({Illecebrum
   verticillatum}); also, the {Polygonum aviculare} or
   knotgrass.
   [1913 Webster]

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