The Collaborative International Dictionary of English v.0.48:

Sutural \Su"tur*al\, a. [Cf. F. sutural, NL. suturals.]
   1. Of or pertaining to a suture, or seam.
      [1913 Webster]

   2. (Bot.) Taking place at a suture; as, a sutural de?iscence.
      [1913 Webster]