HITCHCOCK— REVISIONS OF NORTH AMERICAN GRASSES. 207 



Mountains, Griffiths & Thornber 194; Griffiths 3925, 5910, 5993. Oracle, Hitchcock 

 13286. Bisbee, Mearns 858, 926. St. Johns, Griffiths 5196. Beaver Creek, 

 Purpus 8271. Pantano, Pringle in 1881. Benson, Griffiths 2003. San Bernardino 

 Ranch, Mearns 746, 771, 781. Grand Canyon, Leiberg 5938. Fort Verde, 

 MacDougal 539. Gila Valley, Rothrock 334. Fort Huachuca, Wilcox in 1894. 

 Pearse, Griffiths 1944. Without locality, PaZmer in 1869. 



Lower California: Ensenada, Orcutt in 1889. San Pablo Canyon, Purpus 227. 

 Carmen Island, Pnkner 857 in 1890. La Paz, Palmer 125 in 1890. San Jose del 

 Cabo, Brandegee^LlWdO. Magdalena Bay, Brandegee 3S.in 1889. 



Sonora: Hermosilfo; Hitchcock 3590. Alamos, .Rose 13004. Guaymas, Palmer 53 

 and 340 in 1887. 



Chihuahua: San Luis Mountains, Mearns 2101. Casas Grandes, Nelson 6368. 

 Chihuahua, Hitchcock 7775; Pringle 488. 



Coahuila: Saltillo, Palmer 378 in 1898; Hitchcock 5589, 5604, 5634. Sabinas, JVcfoon 



— 6820. Torreon, Palmer 505 in 1898. — 



Nuevo Leon: Monterrey, Hitchcock 5534, 5542; Pringle 1.968. 



San Luis Potosi: San Luis Potosi, Hitchcock 5665. Cardenas, Hitchcock 5729. 



Zacatecas: Concepcidn del Oro, Palmer 261 in 1904. Zacatecas, Hitchcock 7521. 



Durango: Tlahualilo, Pittier 471. Torreon, Hitchcock 7728. Durango, Hitchcock 

 7623; PaZmer 378 and 872 in 1896. 



Tepic: San Bias, Nelson 4341. 



Queretaro: Queretaro, Hitchcock 5808. 



Hidalgo: Ixmiquilpan, Rose 8993. 



Veracruz: Mirador, Liebmann 362. 



Puebla: Tehuacan, Ttose 10116; Hitchcock 6047. 



Oaxaca: Oaxaca, Hitchcock 6068. Tomellfn, Hitchcock 6241. 



26. Chaetochloa scheelei (Steud.) Hitchc. 



Setaria polystachya Scheele, Linnaea22: 339. 1849. Not Setaria polystachya Schrad. 

 1824. "Auf felsigen Boden nordlich von Neubraunfels : Lindheimer." The type 

 collection is Lindheimer's no. 564 of fascicle III, Flora Texana Exsiccata, 1 collected 

 in 1846. A specimen of this collection is in the National Herbarium. The culm is 

 1.2 meters tall, the sheaths minutely scaberulous, the blades flat, scabrous, 10 to 13 

 mm. wide; the panicle is rather loose, 22 cm. long, the axis villous. 



Panicum scheelei Steud. Syn. PI. Glum. 1: 51. 1854. Based on Setaria polystachya 

 Scheele, not Panicum polystachyum Presi. Steudel spells the name "scheelii." 



Chaetochloa polystachya Scribn. & Merr. U. S. Dept. Agr. Div. Agrost. Bull. 21: 37. 

 /. 22. 1900. Based on Setaria polystachya Scheele. 



description. 



Plants perennial; culms 60 to 120 cm. tall, erect or geniculate at base, compressed 

 below, glabrous, the nodes often appressed-pilose ; sheaths compressed-keeled, 

 glabrous, or scabrous near summit or on the keel, or sometimes more or less hispid on 

 the surface, the collar hispid; ligule densely hispid, 1 to 2 mm. long; blades flat, 

 scabrous or more or less pubescent, 15 to 25 cm. long, as much as 1.5 cm. wide; panicle 

 rather loose, 15 to 20 cm. long, tapering from near the base, the lower branches as 

 much as 3 cm. long, ascending, the axis scabrous-pubescent and rather sparsely 

 villous; bristles mostly 1 to 1.5 cm. long, rather numerous, flexuous, antrorsely 

 scabrous; spikelets a little more than 2 mm. long, pale; first glume about one-third 

 a3 long as the spikelet, 3-nerved; second glume a little shorter than the fertile lemma, 

 5-nerved; sterile lemma as long as the fertile, 5-nerved, the palea small and narrow; 

 fertile lemma finely cross-wrinkled. 



1 See Rep. Mo. Bot. Gard. 18: 151. 1907. 

 168000—20—8 



