Where does “統辞” come from?

統辞 (Japanese) comes from Japanese 統辞論, from Japanese 論, from Japanese 構文論, from Japanese 構文 — structure, syntax of an expression.

統辞 (Japanese): syntax

Definitions

Step	Language	Word	Meaning
1	Japanese	統辞論	syntax as a field of study, syntactics
2	Japanese	論	theory
3	Japanese	構文論	syntax as a field of study, syntactics
4	Japanese	構文	structure, syntax of an expression