Mexican sprangletop

Annual, culms, erect, simple or sparingly branched, 3-10 dm. tall, glabrous; sheaths glabrous; blades firm, flat or loosely involute, scabrous, attenuate, 1-4.5 dm. long, 1-4 mm. wide; panicle 1-3 dm. long, oblong; spikes numerous, approximate, usually stiffly ascending but sometimes ascending-spreading, the lower ones 4-9 cm. long, the upper ones gradually shorter and closer together; spikelets lead colored, 6 to 9 flowered, 5-7 mm. long, appressed; first glume narrow, acute, 1-1.5 mm. long, the second one much broader, abruptly acute or obtuse, mucronate; lemmas awnless, 2-3 mm. long, abruptly subacute or obtuse, minutely lobed, apiculate, the lateral nerves more or less excurrent, the margins pubescent near the base.