The Collaborative International Dictionary of English v.0.48:

Kecksy \Keck"sy\, n.; pl. Kecksies (-s[i^]z). [Properly pl. of
   kex. See Kex.] (Bot.)
   The hollow stalk of an umbelliferous plant, such as the cow
   parsnip or the hemlock. [Written also kex, and in pl.,
   kecks, kaxes.]
   [1913 Webster]

         Nothing teems
         But hateful docks, rough thistles, kecksies, burs.
                                                  --Shak.
   [1913 Webster]