Carex tristachya

Carex tristachya, called the shiny-spike sedge, is a species of flowering plant in the genus Carex, native to south-central and southeast China, Korea, Japan, the Ryukyus, the Philippines, Borneo, and New Guinea. Its seeds are dispersed by ants.

Subtaxa

The following varieties are currently accepted:

Carex tristachya var. pocilliformis Kük. – whole range, except Hainan
Carex tristachya var. tristachya – Japan, Korea, southeast China, Hainan