36 



wide, scabrous and sparingly short pubescent on both sides, mid vein prominent 

 below, becoming obsolete above. Axis of the inflorescence angular, pilose, 

 branches very short, appressed, few-flowered, the lower remote; setae single or 

 in pairs, somewhat flexuous, widely spreading, purple or sometimes green, 5 to 

 15 mm. long. Spikelets ovate, acute, 2 mm. long; first glume broadly cordate, 

 inclosing the base of the spikelet, acute, 3-nerved, one-third as long as the spike- 

 let; second glume obtuse, 5 to 7 nerved, nearly equaling the spikelet in length 

 and closely enveloping it; third glume obtuse, 5-nerved, slightly exceeding the 

 flowering glume in length, sulcate, subtending a short hyaline palea; nerves in 



all the glumes green, promi- 

 nent; flowering glume nearly 

 2 mm. long, ovate, acute, 

 nearly smooth, striate, and 

 very finely transversely wrin- 

 ■ kled below. 

 Texas to Arizona. Mexico. 

 Specimens examined. — Texas: 

 Austin, Hall 1872; no locality, 



Nealley 1888; Kerrville, Smith 

 1897; Heller 1894; Limpia Can- 

 yon, Presidio Co., 130 Nealley 

 1892; Smith 1897; Val Verde, 

 Nealley 1890. New Mexico: 

 2096 Wright 1851-52, and 800 

 Wright 1849, no locality; 

 Mangos, Smith 1897. Arizo- 

 na: Bowie, 4288 Jones 1884; 

 Camp Crittenden, Rothrock 

 1874; Beaver Creek, 606 Mc- 

 Dougal 1891; Clear Creek, 78 

 Toumey 1891 . Mexico : City of 

 Mexico, 3040, 3153 Holway 

 1898; Rio Honda, Holway 

 1896; Chihuahua, 381 Pringle 

 1885; San Luis Potosi, 957 

 Parry & Palmer 1878; Oaxaca, 

 4937 Pringle 1894; no locality, 

 716 Palmer 1896, 1043 Schaff- 

 ner 1876, 441 Bourgeau 1863- 

 1866; Guanajuato, Duges 

 1894. 

 No. 441 Bourgeau, represented in 

 the Gray Herbarium, is cited 

 by Fournier in the original 

 description as one of the type 

 specimens on which this 

 species is based. 



CHiETOCHLOA GRISEBACHII AMPLA var. nov. (Fig. 21.) 



A very robust form, 5 to 8 dm. high, with thicker culms, longer leaves, and long 

 open panicles; leaves lanceolate, 1 to 2 dm. in length, 10 to 15 mm. wide; panicle 

 loose, 12 to 18 cm. long, 2 to 5 cm. in diameter, the branches spreading, much 

 longer than the internodes, the lower 2 to 3.5 cm. in length. 



New Mexico; Mexico. 



Specimens examined. — New Mexico: Organ ^Mountains, Yasey 1881; no locahty, 994 

 Fendler 1847. Mexico: no locality, 4670 Pringle 1896; San Bernardino ranch, 



Fig. 21. — Chcetvc.loa niisclacliU ampla: a, siiikelet showing 

 the seta; Z>, c, viewa of the spikelet; d, flowering glume, 

 dorsal view. 



