Juncaceous

from The Collaborative International Dictionary of English v.0.48

Juncaceous \Jun*ca"ceous\, a. [See {Juncate}.] (Bot.)
   Of. pertaining to, or resembling, a natural family of plants
   ({Juncace[ae]}), of which the common rush ({Juncus}) is the
   type.
   [1913 Webster]