An terminal inflorescence that arises with a new pseudobulb and leaf growth
• (a.) Having flowers and leaves which appear at the same time; -- said of certain plants.
Having flowers and leaves which appear at the same time; inflorescence developing simultaneously with a new shoot.
Syn·an'thous adjective [ Prefix syn- + Greek ... flower.] (Botany) Having flowers and leaves which appear at the same time; -- said of certain plants. 
An terminal inflorescence that arises with a new pseudobulb and leaf growth
synanthous 1. Having flowers and leaves appearing simultaneously. 2. Having flowers united together as in Compositae (closely packed).