Ctenium planifolium (J. Presl) Kunth

Ctenium planifolium (Presl) Kunth, R^v. Gram. Suppl XXII. 1830.
Campulosus planifolius Presl, Rel. Haenk. 1: 287. 1830.
Ctenium glanduhsum Scribn. & Smith, Bot. Gaz. 21 : 362. 1896. (Type from Oaxaca. Nelson 2S14.)
Culms 50-100 cm. tall, pubescent, especially below the spike; sheaths glabrous or scaberulous, rounded on the back; ligule membranaceous, 0.5-1 mm. long; blades 10-20 cm. long, 2-4 mm. wide, flat, acuminate or attenuate, scaberulous; spike 5-10 cm. long, subarcuate, becoming strongly flexuous, the rachis about 1.5 mm. wide, pubescent; first glume 2 mm. long, acute; second glume acuminate, 8 mm. long, pubescent, the tip rather thin, the awn slender, divergent, 2 mm. long; sterile lemmas pubescent and usually villous on the back, the first 3.5 ram. long with a straight or curved awn about 4 mm. long, the second 4.5 mm. long, with a recurved awn 5-6 mm. long, the margins long-ciliate almost from the base to the apex; fertile lemma 5-6 mm. long, the awn straight, 2-3 mm. long, the margins ciliate in the upper half, the cilia 2-3 mm. long; palea of the fertile floret subacute, scabrous on the keels, pubescent on the back, the nerves convergent near the summit, not excurrent; reduced upper florets 1-4, awnless, more or less ciliate on the margins; caryopsis 2 ram. long, obovate, reddish.
Type locality: Mexico (Haenke).
Distribution: Oaxaca and Chiapas.

Ctenium planifolium là một loài thực vật có hoa trong họ Hòa thảo. Loài này được (J.Presl) Kunth mô tả khoa học đầu tiên năm 1833.