mon·o·cha·si·um 
(mŏn′ə-kāzē-əm, -zhē-)
(mŏn′ə-kāzē-əm, -zhē-)n. pl. mon·o·cha·si·a (-zē-ə, -zhē-ə, -zhə)
A cyme having only one lateral flower or branch originating from beneath a terminal flower, resulting in a helicoid or scorpiod inflorescence.
[MONO- + (DI)CHASIUM.]
mon′o·chasi·al adj.