noun
abura-gaya; Scirpus wichurai
A species of sedge native to East Asia. The name is usually written in kana.
アブラガヤは湿地に生える植物です。
Abura-gaya is a plant that grows in wetlands.
The name likely derives from 油 (abura, 'oil') and 茅/萱 (kaya, 'reed' or 'sedge'), but the exact origin is uncertain.