Japan Flora: Weak perennial without stolons or distinct rhizomes; culms somewhat tufted, 20-50 cm. long, slender, smooth, the basal 1 or 2 internodes short, bulbously thickened, globose to ellipsoidal; leaf-blades flaccid, smooth, 5-15 cm. long, 2-4 mm. wide; ligules truncate, 1-2 mm. long; sheaths weakly keeled, the margins connate to the top; panicles very loose, 8-15 cm. long, with rather few spikelets, the branches in pairs, spread­ing, slender, slightly scabrous; spikelets pale green, long-pedi- celled, 5-6 mm. long, 2- to 4-flowered, prominently flattened; glumes unequal, acute, the upper broadly lanceolate, 3-4 mm. long, 3-nerved; lemmas 3.5-4.5 mm. long, acute, green, gla­brous or short-pubescent on the sides at base, the midrib and marginal nerves appressed-pubescent at base, the intermediate nerves very weak, the web wanting. May-June. Woods. 

Honshu, Shikoku, Kyushu; rare.