Acroceras zizanioides (Kunth) Dandy

Panicum zizanioides H. B. K. Nov. Gen. & Sp. 1: 100. 1815
Panicum oryzoides Sw. Prodr. 23. 1788. Not P. oryzoides Ard. 1764. ? Panicum Balbisianum Schultes, in R. & S. Syst. Veg. Mant. 2: 254. 1824. Panicum gr-andiflorum Trin.; Nees, Agrost. Bras. 143, as synonym. 1829. Panicum pseudoryzoides Steud; Syn. Gram. 75. 1854.
Plants perennial, decumbent at base, rooting and rather sparingly branching at the lower
f
nodes; culms spreading or ascending, 0.5-1 meter long beyond the decumbent base, rather
robust, more or less angled, glabrous, rarely with a few appressed hairs below the glabrous nodes; leaf-sheaths densely short-ciliate, otherwise glabrous or papillose-hirsute toward the summit; ligule nearly obsolete; blades 4—15 cm. long, 8-30 mm. wide, cordate-clasping, acuminate, glabrous or rarely with a few appressed hairs; panicles short r exserted, 10-25 cm. long, composed of a few ascending or appressed, stiff, slender branches 3-10 cm. long, bearing through-
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out their length short, appressed branchlets with more or less secund spikelets, mostly two on each branchlet, one nearly sessile, the other on a pedicel about as long as the spikelet, the branchlets angled, scabrous; spikelets 5.5-6 mm. long, 2-2.5 mm. wide, and as thick or thicker, obovoid, abruptly short-pointed, glabrous; first glume about two thirds the length of the spikelet, acute, 3-5-nerved; second glume and sterile lemma equal, abruptly contracted into a short, keeled tip, 5 -nerved, the lateral nerves of the lemma usually obsolete below the summit, the sterile palea about two thirds as long as its lemma; fruit 4.7-5 mm. long, 1.8-2 mm. wide, becoming dark-brown at maturity, smooth and shining, the lemma somewhat boat-shaped and with a short, erose, laterally compressed crest at the apex, the apex of the palea similarly compressed and bent outward.
Type locality: Colombia.
Distribution: Mexico and the West Indies to Paraguay.

Acroceras zizanioides est une espèce de plantes monocotylédones de la famille des Poaceae, sous-famille des Panicoideae, originaire des régions tropicales d'Afrique, d'Asie et d'Amérique.

Ce sont des plantes herbacées vivaces, aux tiges (chaumes) décombantes, de 30 à 100 cm de long.

Acroceras zizanioides est une mauvaise herbe largement répandue en Afrique dans les rizières de plaine et les zones humides aussi bien des régions de forêt que de savane. La plante est classée comme mauvaise herbe « principale » à Tobago et considérée comme une menace pour les forêts et zones humides des régions tropicales des États-Unis.

Panicum grandiflorum adalah spesies tumbuhan yang tergolong ke dalam famili Poaceae. Spesies ini juga merupakan bagian dari ordo Poales. Spesies Panicum grandiflorum sendiri merupakan bagian dari genus Panicum. Nama ilmiah dari spesies ini pertama kali diterbitkan oleh (Hochst. ex A. Rich.) Baron.

Acroceras zizanioides là một loài thực vật có hoa trong họ Hòa thảo. Loài này được (Humb., Bonpl. & Kunth) Dandy mô tả khoa học đầu tiên năm 1931.