The '''Pentecostarion''' (also known as the ''Flowery Triodion'' or , ''Festal Triodion'', ''Paschal Triodion'', or ''Joyful Pentecostarion'') is the service book of the Orthodox Church that provides the texts for the moveable portions of the divine services from [[Pascha]] through the feast of [[All Saints]] (the Sunday following [[Pentecost]]).