seaside arrowgrass (Triglochin maritima var. asiatica)
A salt-tolerant plant found in coastal areas. Botanical term; the variety name is sometimes included in scientific contexts.
Shibana is a perennial plant that grows in wetlands near the coast.
You can see colonies of seaside arrowgrass around here.
Traditionally derived from 塩場菜 “salt-place greens,” referring to the plant’s saline coastal habitat; contraction of 塩場 produced シバナ.