Not an accepted name (status: unknown). The accepted name is Carex foliosissima var. foliosissima 1868.

Carex foliosissima var. latissima (Ohwi) Akiyama, 1932 4% complete

No common name

Consp. Caric. Jap., 203, 1932

There is no corrections for Carex foliosissima var. latissima yet.