Panicum mertensii Roth

Panicum megiston Schultes, in R. & S. Syst. Veg. Mant. 2: 248
1824.
Panicum altissimum G. Meyer, Fl. Esseq. 63. 1818. Not P. altissimum DC. 1817.
Panicum elatius Kunth, R6v. Gram. 38. 1829.
Panicum tuberculatum J. Presl, in Presl, Rel. Haenk. 1: 307. 1830.
Panicum Equisetum Nees; Doell, in Mart. Fl. Bras. 2 2 : 206, as synonym. 1877.
Plants perennial ; culms tall and robust, glabrous ; leaf -sheaths papillose-hispid or papillose only; ligule fimbriate, about 1.5 mm. long; blades firm, ascending, 15-40 cm. long or more, 1.5-3 cm. wide, linear-lanceolate, slightly narrowed to the rounded base, glabrous; panicles finally exserted, 40-60 cm. long, the stiff main axis striate-angled, smooth or scabrous, the branches in distant verticils, often as many as 20-30 in a verticil, 10-20 cm. long, slender, stiffly or sinuously ascending, very scabrous, nearly simple, bearing the scattered, short-pediceled spikelets along the upper half or third; spikelets usually purplish at maturity, about 3.4 mm. long, 1.5 mm. wide, globular-obovoid, glabrous; first glume scarcely one third the length of the spikelet, pointed ; second glume slightly shorter than the sterile lemma, both abruptly apiculate, 7-9nerved, the glume about equaling the fruit, the sterile palea rather firm, about as long as the fruit; fruit 2.8 mm. long, 1.4 mm. wide, abruptly pointed, smooth and shining.
Type locality: British Guiana. Distribution: Cuba; Mexico to Paraguay.

Panicum mertensii adalah spesies tumbuhan yang tergolong ke dalam famili Poaceae. Spesies ini juga merupakan bagian dari ordo Poales. Spesies Panicum mertensii sendiri merupakan bagian dari genus Panicum. Nama ilmiah dari spesies ini pertama kali diterbitkan oleh Roth.

Panicum mertensii là một loài thực vật có hoa trong họ Hòa thảo. Loài này được Roth mô tả khoa học đầu tiên năm 1817.