えぞきすげじゃなかったです
蝦夷黄菅じゃなかったです
ezokisugejanakattadesu

Noun
Desu Copula

The polite, past negative form of えぞきすげ

1. It wasn't Ezo yellow sedge.

Past/Perfective
Negative
Polite
Casual Register
Usually Written in Kana