Calamagrostis hillebrandii is a slender, short-rhizomatous perennial with erect, tufted, glabrous culms 30 to 50 cm (12 to 20 in) tall. Sheaths are glabrous, longer than the internodes, with tightly overlapping margins, 10 to 15 cm (12 to 20 in) long, and 2 to 4 mm (0.08 to 0.2 in) wide....