Sympode, Sympodium
"A stem made up of a series of superposed branches in a way to imitate a simple axis; a Sympodial stem" (Asa Gray).
SYN. A term which, in Greek compounds, signifies union, adhesion, or growing together: e.g., Synantherous, stamens coalescent by their anthers; Syncarpous, composed of two or more united carpels.