Panicum longum Hitchc. & Chase

Panicum longum Hitchc. & Chase, Contr. U. S. Nat. Herb. 15:
111. 1910.
Panicum munitum Trin.; Steud. Nom. Bot. ed. 2. 2: 260, hyponym. 1841.
Panicum pilosum macranthum Scribn. Circ. U. S. Dept. Agr. Agrost. 19: 1. 1900. Not P. macranthum Trin. 1825.
Plants perennial, ascending or spreading from a more or less geniculate base; culms rather robust, 1.2-2 meters long, simple or sparingly branching from the lower nodes, glabrous, the nodes glabrous; leaf-sheaths nearly as long as the internodes or overlapping, papillose or 233
papillose-hirsute (the greater number of papillae without hairs); ligule about 0.5 mm. long; blades ascending or spreading, 10-25 cm. long, 6-12 mm. wide, linear, scarcely narrowed to the rounded base, very sparsely papillose-pilose on the upper surface, glabrous beneath or with a few papillae; panicles short-exserted or included at the base, 20-25 cm. long, 2-5 cm. wide, the branches raceme-like, the lower solitary, distant, the middle and upper opposite or verticillate, the rachises and upper part of the main axis with stiff hairs slightly exceeding the short-pediceled, secund, approximate, but scarcely crowded spikelets; spikelets mostly in pairs, 2.5 mm. long, 0,9 mm. wide, pointed, strongly nerved, the nerves minutely scabrous toward the summit; first glume about half the length of the spikelet, pointed; second glume shorter than the sterile lemma, both slightly exceeding the fruit, the sterile palea obsolete; fruit 2.1 mm. long, 0.8 mm. wide, acute, thin in texture, scabrous toward the summit.
Type locality: Jalapa, Vera Cruz.
Distribution: Vera Cruz.