Perotis vaginata Hack.

Loosely tufted annual; culms 12–40 cm. high, geniculately ascending, robust.. Leaf-blades lanceolate, 1–4 cm. long, 1.5–6 mm. wide.. Spike 3–15 cm. long, embraced below by the uppermost leaf-sheath, the spikelets densely packed and ascending.. Spikelets 4–5.5 mm. long, with a slender stipitiform callus 0.7–1.5 mm. long; glumes irregularly appressed scaberulous to glabrescent, the midnerve of the upper glume broad, not depressed, ± scabrid; awns 13–25 mm. long, stiff.. Caryopsis flattened.