Gouinia virgata (J. Presl) Scribn.

Gouinia virgata (Presl) Scribn. Bull. U. S. Dep. Agr. Agrost 4: 10. 1897.
Bromus virgatus Presl, Rel. Haenk. 1: 263. 1830.
Fesluca laxiflora A. Rich, in Sagra, Hist. Cuba 11: 318. 1850.
Festuca Fournieriana Herasl. Biol. Centr. Am. Bot. 3: 581. 1885.
Gouinia polygama Fourn.; Hemsl. Biol. Centr. Am. Bot. 3: 581, as synonym of Fesluca Fournieriana
Hemsl. 1885; Fourn. Mex. PI. Gram. 2: 103. 1886. Gouinia polygama var. major Foum. Mex. PI. Gram. 2: 103. 1886. Diplachne virgata Hack. Oesterr. Bot. Zeits. 52: 276. 1902. (Based on Bromus virgatus Presl.)
Culms erect from a dense knotty base, 30-150 cm. tall; sheaths more or less keeled, longer than the internodes, scaberulous, papillose-pilose toward the summit; blades flat, 15-45 cm. long, 5-15 mm. wide, smooth or nearly so on both surfaces, the margins scabrous; ligule membranaceous, erose, about 1 mm. long; panicle 15-35 cm. long, the branches rather stiffly spreading, the lower 8-20 cm. (usually about 12 cm.) long, spikelet-bearing from the base or nearly so; spikelets lanceolate, 8-15 mm. long; glumes acute, scabrous on the keels, the first 4-5 mm. long, 1-3-nerved, the second 5-6 mm. long, 3-5-nerved (rarely 7-nerved); lemma 8-10 mm. long, acuminate, awned from the tip, the awn 10-17 mm. long; palea acuminate, 7-8 mm. long, the margins densely pilose below.
Type locality: Mexico.
Distribution: Wooded hills, Mexico and the West Indies, and southward to Peru.

Gouinia longiramea Swallen, Publ. Carnegie Inst. Wash 436: 334. 1934.
Culms erect, 1.5 meters tall, somewhat woody, glabrous; sheaths hairy on the collar, scaberulous, the lower shorter than the internodes, the upper overlapping; ligule membranaceous, erose, 1 mm. long; blades flat, acuminate, 25-35 cm. long, mostly 8-10 mm. wide, smooth except for the scabrous margins and a few hairs on both surfaces near the base; panicle SO cm. long, the simple branches distant, drooping, mostly 20-30 cm. long; spikelets 10-15 mm. long, 4-5-flowered, 2-5 cm. distant, appressed to the branches, the pedicels 2-5 mm. long; glumes acute, the first 4-5 mm. long, 3-5-nerved, the second 6-7 cm. long, 5-7-nerved; lemma acuminate, 8-10 mm. long, 5-7-nerved, the awn slender, scabrous, 10-20 mm. long; palea equal to or a little shorter than the lemma, the teeth often mucronate, the margins pilose.
Typb locality; Chichen Itz4, Yucatan (Swallen 2385). Distribution: Brushy borders, Yucatan Peninsula.