Sour grass

Creeping perennials with long leafy stolons rooting at the nodes and forming loose mats.

Culms erect or ascending, to c. 1 m tall; nodes pubescent or glabrous, those of the stolons usually conspicuously pilose. Sheaths hairy on the margins and at the junction with the blade; ligule truncate, c. 1 mm long; blade 5–13 mm wide, glabrous or sparingly hairy, scabrous or stiffly hairy on the margins.