30 



Bromus carinatus arizonicus Shear, U. S. Dept. Agr. Div. Agros. Bui. 23: 61 



(1900). 

 Sierra Madre Mountains, near Santa Teresa, Territorio de Tepic, 2138 J. N. Rose, 



August 9, 1897. 

 Bromus ciliatus L. Sp. PI. 76 (1753). 

 Sierra de San Felipe, altitude 3,075 m., State of Oaxaca, 925 C. L. Smith, September, 



1894. 

 Bromus compressus Lag. Elench. 4 (1816). 

 Saltillo, State of Coahuila, 5 E. Palmer, April, 1898; 366 E. Palmer, September, 



1898, in alfalfa, along irrigating ditches. 

 Bromus laciniatus Beal, Grasses N. A. 2: 615 (1896). 

 Sierra de San Felipe, State of Oaxaca, 942 C. L. Smith, September, 1894. 

 Bromus porteri frondosus Shear, U. S. Dept. Agr. Div. Agros. Bui. 23: 37 (1900). 

 Near Plateado, State of Zacatecas, 2727 J. N. Rose, September 1, 1897. 

 BROMUS SCHAFFNERI (Fourn.) Scribn. & Merrill, n. comb. {Bromus Jtookeri 



scha^ffneri Fourn. Mex. PI. 2: 127 (1881).) 

 Durango, State of Durango, 171 E. Palmer, June, 1896, 743 E. Palmer, September, 



1896. 

 Agropyron arizonicum Scribn. & Smith, U. S. Dept. Agr. Div. Agros. Bui. 4: 27 



(1897). 



Base of Sierra Madre Mountains, State of Chihuahua, near the border of Mexico, 

 6495 E. W. Nelson, September 29, 1899. 



Elymus brachystachys Scribn. & Ball. (p. 47). 



Saltillo, State of Coahuila, 260 E. Palmer, June, 1898. 



ELYMUS PRINGLEI Scribn. & Merrill, sp. nov. 



A slender, erect, csespitose perennial, 6 to 9 dm. high, with slender culms, linear or 

 linear-lanceolate leaves and rather loosely flowered, pale green panicles 4 to 12 

 cm. long. Culms very slender, glabrous, often somewhat geniculate below; 

 nodes smooth; sheaths smooth, striate, mostly shorter than the internodes; ligule 

 hyaline, obtuse, slightly toothed, about 1 mm. long; leaf-blades 10 to 20 cm. 

 long, 3 to 8 mm. wide, scabrous on both sides. Rachis somewhat compressed, 

 slightly scabrous, somewhat strigose above, the internodes shorter than the 

 spikelets. Spikelets 2 at each node, 3 to 4 flowered, about 10 mm. long, 

 exclusive of the awns; empty glumes subequal, scabrous, subulate-setaceous, 

 about 22 mm. long; flowering glumes lanceolate, acuminate, 5-nerved, strigose- 

 pubescent, with rather short, stiff hairs, especially above, liearing a straight, 

 slender, scabrous awn 8 to 15 mm. long. Palea lanceolate, obtuse, strongly ser- 

 rulate-scabrous on the margins above, 7 to 8 mm. long. 



Type specimen collected in wet soil in a valley near Tula, State of Hidalgo, altitude 

 2,200 m., 6637 C. G. Pringle, June 8, 1897, distributed as Elymus botteri; 7165 

 C. G. Pringle, same locality, October 24, 1896, belongs here. 



This species differs from E. interruptus Buckl. in its slender habit, narrower, seta- 

 ceous empty glumes, and strongly strigose-pubescent flowering glumes. 



*Sitanion brevifolium J. G. Smith, U. S. Dept. Agr. Div. Agros. Bui. 18:17 (1899). 



Cerro Ventoso, above Pachuca, State of Hidalgo, altitude 2,600 m., 6944 C.G. Pringle, 

 August 18, 1899. 



Arundinaria longifolia Fourn. Mex. PI. 2: 131 (1881). 



Between Pedro Paulo and San Blascito, Territorio de Tepic, 3344 J. N. Rose, August 

 4, 1897; near Huasemote, State of Durango, 3494 J. N. Rose, August 15, 1897. 



