The Collaborative International Dictionary of English v.0.48:

Peristerion \Per`is*te"ri*on\, n. [NL., fr. Gr. ? a dovecote, a
   kind of verbena, fr. peristera` a dove, pigeon; cf. L.
   peristereon.] (Bot.)
   The herb vervain (Verbena officinalis).
   [1913 Webster]