Panicum madipirense Mez

Annual; culms erect, 25–120 cm. high, glabrous or with soft deflexed or spreading hairs.. Leaf-blades linear-lanceolate, 8–24 cm. long, 6–12 mm. wide, cordate at the base, flat, membranous, often yellowish green on drying, glabrous to pilose, acute to acuminate.. Panicle oblong, 10–20(–30) cm. long, much branched, the branches fine and ascending.. Spikelets oblong, 2.5–3.7 mm. long, glabrous, usually pale yellowish green, acute; lower glume broadly ovate, 1/4 the length of the spikelet, cufflike, membranous, 1–sub-7-nerved, acute; upper glume ovate, membranous, 9-nerved, acute; lower lemma ovate with two flaps at the apex, 9-nerved, male, its palea well developed; upper lemma beaked, smooth or minutely scaberulous in the upper half or at the apex only.