Bouteloua repens (Kunth) Scribn. & Merr.

Bouteloua repens (H.B.K.) Scribn. & Merr. Bull. U. S. Dep Agr. Agrost. 24: 26. 1901.
Dinebra repens H.B.K. Nov. Gen. & Sp. 1: 172. 1816.
^Bouteloua bromoides Lag. Gen. & Sp. Nov. 5. 1816.
Alheropogon repens R. & S. Syst. Veg. 2: 416. 1817. (Based on Dinebra repens H.B.K.)
''Actinochloa bromoides R. & S. Syst. Veg. 2: 420. 1817. (Based on Bouteloua bromoides Lag.)
Eutriana repens Trin. Gram. Unifl. 241. 1824. (Based on Alheropogon repens R. & S.)
Perennial; culms erect or ascending, rather stiff, branching, 20-50 cm. tall; sheaths glabrous or sparsely papillose-pilose; ligule minutely ciliate, 0.5 mm. long; blades usually firm, flat, 8-15 cm. long, 2-5 mm. wide, glabrous or scabrous, sometimes more or less papillose or papillosepilose; spikes 5-10, 1.5-2.5 cm. long, rather close together, appressed or spreading, falling entire; glumes acuminate, subequal, about 7 mm. long, scabrous or hispid on the keel; lemma of fertile floret 8 mm. long, acute, the central awn 2-4 mm. long, the lateral 1.5-2 ram. long; rudiment glabrous, about 6 mm. long, deeply cleft, the awn from between the lobes 8-10 mm. long, broad at the base, scabrous, the lateral awns much more slender and a little shorter than the central one.
Type locality: Acapulco (Humboldt &* Bonpland).
Distribution: Rocky slopes, western Mexico to Panama.

Bouteloua pubescens Pilger, Verb. Bot. Ver. Brand 51:193. 1909.
Perennial; culms tufted, erect or ascending, 20-30 cm. tall, simple or sparingly branched, the lower internodes rather short; sheaths much longer than the internodes or the uppermost shorter, densely velvety-pubescent; ligule ciliate, 0.2 mm. long; blades 5-11 cm. long, 2-5 mm. wide, flat, acuminate, densely soft-pubescent or pilose, the margins papillose; spikes 6-8, ascending or spreading, falling entire, appro.ximate, or the lower ones remote, 1-2 cm. long, the rachis scabrous; glumes acuminate, 5 mm long, scabrous on the keels; fertile floret bearded at the base; lemma 5-6 mm. long, glabrous, acute, the nerves excurrent 1 mm., the lateral ones about 1 mm. from the summit; palea a little longer than the lemma, narrowed toward the summit, the keels approximate, scabrous; upper floret 6-7 mm. long, staminate, glabrous at the base, the lemma deeply 3-cleft, the lateral lobes very narrow, the central 2-dentate, the awns 3-4 mm. long, scabrous.
Typb locality: Malacatan, Guatemala (Seler 3234). Distribution: Sandy ground; known only from the type collection.

Bouteloua heterostega (Trin.) D. Griff. Contr. U. S. Nat Herb. 14: 414. 1912.
Heterosleca juncifolia Desv. Nouv. Bull. Soc. Paris 2: 188. 1810.
Eutriana Heterostega Trin. Gram. Unill. 242. 1824. (Based on Heterosteca juncifolia Desv.). Atheropogon juncifolius Spreng. Syst. I: 294. 1825. (Based on Heterosteca juncifolia Desv.) Eutriana juncifolia Kunth. R^v. Gram. 95. 1829. (Based on Heterosteca juncifolia Desv.) Bouteloua Humboldtiana Griseb. Mem. Am. Acad. II. 8: 532. 1862. (Type from Cuba. Wright 739.) Bouteloua porphyrantha Wright, Anal. Acad. Ci. Habana 8: 201. 1871. (Type from Cuba, Wright
739.) Atheropogon americana var. depauperata Fourn. Mex. PI. Gram. 2: 139. 1886. Heterosleca rhadina Nash, Bull. Torrey Club 30: 386. 1903. (Type from Puerto Rico, Heller 6057.)
Perennial; culms slender, branching, decumbent-spreading, 15-50 cm. long, glabrous; sheaths shorter than the internodes, glabrous; ligiUe minutely ciliate, 0.3 mm. long; blades flat, or involute toward the tip, straight or flexuous, 4-10 cm. long, 1-2 mm. wide, smooth or scabrous, rarely pilose, the margins sparingly papillose; spikes mostly 5-10, about 1.5 cm. long, stiffly spreading, falling entire, bearing 2-4 appressed spikelets, the rachis narrow, scabrous on the margins; glumes acuminate, 4-5 mm. long, scabrous or nearly glabrous on the keel; fertile floret 6-7 mm. long, glabrous, or short-bearded at the base, the awns about 1 mm. long; rudiment 5 mm. long, lobed, the lobes acute, sometimes rather short, the awn from between the lobes 5-8 mm. long, thickened toward the base, scabrous, the lateral awns more slender, nearly as long as the central.
Type locality: West Indies.
Distribution: Rocky hillsides and dry open ground, Cuba, Hispaniola, and Puerto Rico.

Bouteloua filiformis (Fourn.) D. Griff. Contr. U. S. Nat Herb. 14:413. 1912.
Alheropogon filiformis Fourn. Mex. PI. Gram. 2: 140. 1886.
Perennial; culms in small dense tufts, simple or branching, erect or decumbent, spreading at the base, 15-50 cm. tall, glabrous; sheaths glabrous or sparsely pilose; blades flat, acuminate, mostly 5-10 cm. long, 1-2 mm. wide, glabrous or sparsely pilose, the margins scabrous, usually more or less papUlose-ciliate ; ligule ciliate, less than 1 mm. long; spikes 5-10, ascending or spreading, mostly 1-2 cm. long, falling entire, the rachis shortly ciliate, densely pubescent at the base; glumes acuminate, subequal or the second a Uttle longer, mostly 5-7 mm. long, glabrous, the keel scabrous to hispid; lemma about 7 mm. long, glabrous or bearded at the base, acuminate, the awns about 1 mm. long, scabrous; upper floret usually staminate, sometimes perfect, glabrous or bearded at the base, the lemma minutely bifid, the central awn thickish, 3-8 mm. long, the lateral ones more slender, a Uttle shorter than the central.
Type locality: Hacienda de la Naranja, Mexico {Karwinsky 991b). Distribution: Rocky hills and open ground, Texas to Arizona and Guatemala.

Perennials, Terrestrial, not aquatic, Stems nodes swollen or brittle, Stems erect or ascending, Stems geniculate, decumbent, or lax, sometimes rooting at nodes, Stems caespitose, tufted, or clustered, Stems terete, round in cross section, or polygonal, Stems branching above base or distally at nodes, Stem internodes hollow, Stems with inflorescence less than 1 m tall, Stems, culms, or scapes exceeding basal leaves, Leaves mostly basal, below middle of stem, Leaves conspicuously 2-ranked, distichous, Leaves sheathing at base, Leaf sheath mostly open, or loose, Leaf sheath smooth, glabrous, Leaf sheath hairy, hispid or prickly, Leaf sheath hairy at summit, throat, or collar, Leaf sheath and blade differentiated, Leaf blades linear, Leaf blades very narrow or filiform, less than 2 mm wide, Leaf blades 2-10 mm wide, Leaf blades mostly flat, Leaf blades mostly glabrous, Leaf blades more or less hairy, Ligule present, Ligule a fringed, ciliate, or lobed membrane, Inflorescence terminal, Inflorescence with 2 or more spikes, fasci cles, glomerules, heads, or clusters per culm, Inflorescence a panicle with narrowly racemose or spicate branches, Inflorescence with 2-10 branches, Inflorescence branches 1-sided, Inflorescence branches terminating in bristle or point, Flowers bisexual, Spikelets sessile or subsessile, Spikelets laterally compressed, Spikelet less than 3 mm wide, Spikelets with 1 fertile floret, Spikelets solitary at rachis nodes, Spikelets all alike and fertille, Spikelets bisexual, Inflorescence branches deciduous, falling intact, Spikelets secund, in rows on one side of rachis, Rachilla or pedicel glabrous, Glumes present, empty bracts, Glumes 2 clearly present, Glumes equal or subequal, Glumes equal to or longer than adjacent lemma, Glume equal to or longer than spikelet, Glumes keeled or winged, Glumes 1 nerved, Lemma coriaceous, firmer or thicker in texture than the glumes, Lemma 3 nerved, Lemma glabrous, Lemma apex acute or acuminate, Lemma apex dentate, 3-5 fid, Lemma mucronate, ver y shortly beaked or awned, less than 1-2 mm, Lemma distinctly awned, more than 2-3 mm, Lemma with 3 awns, Lemma awn less than 1 cm long, Lemma awns straight or curved to base, Lemma margins thin, lying flat, Lemma straight, Palea present, well developed, Palea membranous, hyaline, Palea shorter than lemma, Palea 2 nerved or 2 keeled, Stamens 3, Styles 2-fid, deeply 2-branched, Stigmas 2, Fruit - caryopsis, Caryopsis ellipsoid, longitudinally grooved, hilum long-linear.

Bouteloua repens, colloquially known as slender grama, is a grass species in the grama genus native to the southwestern United States and northern Mexico.

Bouteloua repens là một loài thực vật có hoa trong họ Hòa thảo. Loài này được (Kunth) Scribn. & Merr. mô tả khoa học đầu tiên năm 1901.