Bouteloua media (E. Fourn.) Gould & Kapadia

Bouteloua pringlei Scribn. Circ. U. S. Dep. Agr. Agrost 30:4. 1901.
Perennial; culms tufted, erect, branching at the middle and upper nodes, about 1.5 meters tall, glabrous; sheaths nearly all shorter than the internodes, glabrous below except for the ciliate margins, very densely papillose-pilose upward, the hairs appressed or spreading, mostly implicate; ligule membranaceous, more or less erose, about 0.2 mm. long; blades flat, firm, acuminate or attenuate, as much as 30 cm. long, 5-7 mm. wide, papillose or papillose-pilose, the margins scabrous-serrate; spikes numerous, falling entire, spreading, sometimes reflexed, small and rather crowded toward the upper part of the axis, more distant and larger downward, the lowermost as much as 3 cm. long, sometimes with very short branchlets; spikelets more or less pectinate, at least those on the lower spikes; first glume subulate, 2-3 mm. long, more or less pilose; second glume broader, acuminate, pubescent and sparsely pilose; lemma 3.5-4 mm. long, glabrous on the back, pilose with spreading hairs on both sides of the lateral nerves, 3-toothed, the middle one acute, the lateral ones acuminate, awn-pointed; rachilla produced beyond the fertile floret as a short stipe; the rudiment obsolete.
Type locality: Limestone ledges above Iguala, Guerrero {Pringle 837 4). Distribution: Known only from the type locality.

Bouteloua latifolia Swallen, sp. nov
Perennial; culms branching at the upper nodes, erect from a hard rhizomatous base, 160 cm. tall, glabrous; sheaths, except the lowermost, shorter than the internodes, glabrous; ligule membranaceous, about 0.3 mm. long; blades flat, attenuate, 30-45 cm. long, 7-8 mm. wide, glabrous on both surfaces, the margins scabrous; spikes falling entire, about 50 on a common axis about 20 cm. long, progressively longer and more remote from the top downward, the lowermost as much as 3 cm. long, usually spreading, sometimes reflexed; spikelets crowded, appressed or somewhat spreading; first glume subulate, .scabrous, 2.5-3 mm. long, the second broader, acuminate, 5 mm. long, scabrous and often villous, especially on both sides of the midnerve; lemma 5 mm. long, the margins conspicuously ciliate, the back sparsely appressedpilose on the lower part on both sides of the midnerve, the tip acute, mucronate, the lateral nerves excurrent, the awns about 1 mm. long; rudiment 5 mm. long, the lemma glabrous on the back, the margins appressed-hispid below the tip, deeply cleft, the awn from betw('en the lobes 5-7 mm. long, or shorter in the si)ikelets of the upper sijikes, the lateral nerves excurrent below the middle of the lemma, the awns about 3 mm. long, appressed-hispid at thi; base, the palea well developed, pubescent.
Perennis; culmi erecti, ramosi, 160 cm. alti, glabri; vaginae internodiis breviores, glabrae; ligula membranacea, 0.3 mm. longa; laminae 30-45 cm. longae, 7-8 mm. latac, planae, attcnuatae, glabrae, raarginibus scabris; spicae circa 50, infima ad 3 cm. longa, divergens vel recurvata; spiculae densae, appressae vel divergentes; gluma prima 2.5-3 mm. longa, subulata, scabra, gluma secunda latior, 5 mm. longa, scabra et villosa; lemma 5 mm. longum, acutum, mucronatum, aristis lateralibus 1 mm. longis, in costa sparse pilosura, marginibus ciliatis; flosculus imperfectus 5 mm. longus, lemmate ad costam glabro, marginibus hispidis, fisso, arista inter lobos 5-7 mm. longa; aristis lateralibus circa 3 mm. longis.
Type collected on hills near Yautepec, Morelos, alt. 1200 meters, October 22, 1902, Pringle 11217 (U. S. Nat. Herb. no. 460593).
Distribution: Known only from the type locality.

Bouteloua media là một loài thực vật có hoa trong họ Hòa thảo. Loài này được (E.Fourn.) Gould & Kapadia mô tả khoa học đầu tiên năm 1964.