Plants perennial; rhizomatous. Culms to 38 cm. Sheaths closed for 1/3-3/4 their length; auricles absent; ligules membranous, acute to truncate, lacerate; blades flat or folded, glabrous. Inflorescences partly open panicles; branches stiff, glabrous, lower branches sometimes reflexed. Spikelets somewhat compressed, with 2-4 florets. Glumes subequal, ovate, membranous, acute; calluses with scant, stiff hairs; lemmas ovate, membranous to subcoriaceous, 1(3)-veined, apices truncate and lacerate-dentate; paleas 2-keeled, glabrous; anthers indehiscent; ovaries glabrous; lodicules 2, membranous. Caryopses apparently absent.
Discussion
×Arctodupontia is a sterile hybrid between the two monotypic genera Dupontia and Arctophila. It is intermediate between the two parents.