Source : Webster's Revised Unabridged Dictionary (1913)

Monostichous \Mo*nos"ti*chous\ (m[-o]*n[o^]s"t[i^]*k[u^]s), a.
   [See {Monostich}.] (Bot.)
   Arranged in a single row on one side of an axis, as the
   flowers in grasses of the tribe {Chlorid[ae]}.