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.