The Collaborative International Dictionary of English v.0.48:

Pellitory \Pel"li*to*ry\, n. [OE. paritorie, OF. paritoire, F.
   pari['e]taire; (cf. It. & Sp. parietaria), L. parietaria the
   parietary, or pellitory, the wall plant, fr. parietarius
   belonging to the walls, fr. paries, parietis a wall. Cf.
   Parietary.] (Bot.)
   The common name of the several species of the genus
   Parietaria, low, harmless weeds of the Nettle family; --
   also called wall pellitory, and lichwort.
   [1913 Webster]

   Note: Parietaria officinalis is common on old walls in
         Europe; Parietaria pennsylvanica is found in the
         United States; and six or seven more species are found
         near the Mediterranean, or in the Orient.
         [1913 Webster]