Trachypogon montufari Nees, Agrost. Bras. 342 (1829). 



Las Sedas, altitude 2,000 in., State of Oaxaca, 953 C. L. Smith, September 8, 1894; 

 Durango, State of Durango, 383 E. Palmer, July, 1896. 



Elionurus barbiculmis Hark, in DC. Monog. Phan. 6: 339 (1889). 



Durango, State of Durango, 549 E. Palmer, August, 1890; near San Juan Capistrano, 

 State of Zacateoas, 2407 J. N. Rose, August 18, 1897. 



rjlionurus tripsacoid.es H. B. K. in Willd. Sp. PI. 4: 941 (err. typ. 741) (1805). 



.rala])a. State of Vera Cruz, 1623i C. L. Smith, 1894. 



Andropogon contortus L. Sp. PI. 1045 (1753). " {Heteropogon contorius P. & S. Syst. 

 2: 836 (1817).) 



Durango, State of Durango, 540 E. Palmer, August, 1896; Bolanos, State of Jalisco, 

 2938 J. N. Rose, September 10-19, 1897. 



Andropogon liebmanni raripilis Hack, in DC. 3Ionog. Phan. 6: 413 (1889). 



In the Sierra Madre Mountains, near Santa Teresa, Territorio de Tepic, 2222 J. N. 

 Rose, August 12, 1897. 



Andropogon macrourus Michx. Fl. Ror. Am. 1: 56 (1803). 



San Antonio Valley, State of Oaxaca, 970 C. L. Smith, September 1, 1894; Durango, 

 State of Durango, 251 E. Palmer, June, 1896. 



Andropogon melanocarpus Ell. Sk. Bot. S. C. and Ga. 1: 146 (1817) {Heteropogon 

 //(('A(/((;co('^j*(s Benth. Journ. Linn. Soc. 19: 71 (1881).) 



In the Sierra Madre Mountains, west of Bolanos, State of Jalisco, 2596 J. N. Rose, 

 September 15-17, 1897. 



Andropogon nutans incompletus Hack, in DC. Monog. Phan. 6: 531 (1889). 



Las Sedas, State of Oaxaca, 917 C. L. Smith, September, 1894. 



ANDROPOGON PRINGLEI Scribn. & Merrill, sp. nov. 



An erect csespitose perennial 9 to 11 dm. high, with slender culms, short leaves, and 

 slender racemes 3 to 6 cm. long, terminal on the culm or its branches. Culms 

 cylindrical, purplish, very smooth; nodes glabrous; sheaths much shorter than 

 the internodes, glabrous, striate, rather loose, the lowermost compressed, the 

 upper ones somewhat inflated; ligule very short, truncate, ciliate-fringed with 

 short hairs; leaf-blades pale green, those of the innovations linear, 8 to 11 cm. 

 long, 1 to 2 mm. wide, pilose, with long white hairs on the upper surface near 

 the base, smooth beneath, those of the culm rather rigid, linear-lanceolate, acute, 

 2 to 6 cm. long, 3 to 4 mm. wide, plane or folded, minutely strigose-pubescent 

 at the throat, strongly serrulate-scabrous on the keel and margins near the 

 apex, otherwise smooth. Racemes 3 to 4, subdigitate, rarely solitary, somewhat 

 inclosed by the upper sheath or finally exserted; common rachis 1 to 2 cm. 

 long; axis of the racemes 7 to 11 jointed, subflexuous, pilose with long white 

 hairs, smooth and fiattened on one side. Sessile spikelets linear-lanceolate, acute 

 or acuminate, 6 to 8 mm. long, about twice exceeding tlie joints of the rachis; 

 first glume lanceolate, acute, 2-toothed at the apex, scabrous on the keels above, 

 otherwise glabrous, plane or slightly sulcate; second glume equaling the first, 

 1-nerved, acute, glabrous except at the scabrous apex; third glume about as long 

 as the sec(jnd, hyaline, smooth; flowering glume about 4 mm. long, hyaline, 

 smooth, faintly 3-nerved, deeply cleft at the apex, bearing a slender geniculate 

 awn 10 to 14 mm. long, which is twisted below the geniculation, scabrous above. 

 - Stamens one, about 1 mm. long. Callus-hairs about 1 mm. long. Pedicellate 

 spikelets much smaller than the se.ssile ones, reduced to one or two purplish 

 glumes, very narrowly linear-lanceolate, about 5 mm. long, scabrous at the apex; 

 pedicels slender, slightly enlarged above, about three-fourths as long as the 

 sessile spikelet, rather densely silky-bearded with erect or spreading white hairs 

 about 4 mm. long. 



Type specimen 6577 C. G. Pringle, Valley of Mexico, Federal District, October 23, 1896. 



