HITCHCOCK REVISIONS OF NORTH AMERICAN GRASSES. 205 



landierianum Texano Mexicanum,' no locality or date." The type specimen bears 3 

 panicles, all past maturity and containing only a few spikelets. It resembles Pringle 

 1968 in the pilose blades but the panicles are shorter and more compact. The label 

 bears the following, "de Santander a Victoria" (probably in Tamaulipas). 



Chaetochloa leucopila Scribn. & Merr. IT. S. Dept. Agt. Div. Agrost. Bull. 21: 26. 

 ./. 14. 1900. "Type specimen collected at Parras, state of Coahuila, Mexico, 1363 E. 

 Palmer, June 1880." The type specimen, in the National Herbarium, in habit 

 resembles the narrow-leaved form of C. macrostachya, with narrow slender panicles, a 

 form common in Texas. It differs, however, in the pilose upper surface of the narrow 

 folded blades. 



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

 29./. 16. 1900. Based on Setaria macrostachya H. B. K. 



Chaetochloa rigida Scribn. & Merr. U. S. Dept. Agr. Div. Agrost. Bull. 21 : 30. 1900. 

 "Lower California: La Paz, 125 E. Palmer 1890 (type)." Two other specimens are 

 cited, Carmen Island, Palmer 857 in 1890 

 and San Jose del Cabo, Brandegee 28 in 

 1890. See further notes at the end of the 

 description of C. macrostachya. 



Setaria leucopila Schum. Just's Bot. 

 Jahresb. 28 1 : 417. 1902. Based on Chae- 

 tochloa leucopila Scribn. & Merr. 



Chamaeraphis macrostachya Kuntze; 

 Stuck. Anal. Mus. Nac. Buenos Aires 

 11: 76. 1904, in a footnote. Based on 

 Setaria macrostachya H. B. K. 



V f5S8^ to 



DESCRIPTION. 



Plants perennial, tufted, usually pale or 

 glaucous, more or less hirsute around the 

 base; culms erect or geniculate at base, 

 scabrous below the panicle and usually 

 below the glabrous or hispidulous nodes, 

 40 to 120 cm. tall; sheaths more or less 

 compressed-keeled, glabrous or usually 

 scaberulous toward the summit, rarely 

 pubescent, ciliate on the margin, the collar 

 hispidulous or glabrous; ligule densely 

 ciliate, 1 to 3 mm. long; blades flat or 

 folded, scabrous on the upper surface, 

 smooth or scabrous beneath, rarely pubes- 

 cent on both surfaces, 15 to 40 cm. long, 3 

 to 5 mm. wide; panicles spikelike, 10 to 25 cm. long, or sometimes shorter, somewhat 

 tapering above but not attenuate, more or less interrupted or lobed, sometimes rather 

 open below, the branches usually short, the axis pubescent and often also villous with 

 hairs 1 to 2 mm. long; bristles mostly single below each spikelet, 10 to 15 mm. long with 

 shorter ones intermixed, flexuous, antrorsely scabrous; spikelets pale (the nerves usually 

 pale), 2 to 2.5 mm. long, turgid on the convex side, sometimes strongly so at maturity; 

 first glume about half as long as the spikelet, 3-nerved; second glume two-thirds to three- 

 fourths as long as the spikelet, 5 to 7-nerved ; sterile lemma as long as the fertile, 5-nerved, 

 the palea narrow, a little shorter than the lemma; fertile lemma rather sharply but 

 finely marked with cross-wrinkles. 



The species is somewhat variable in habit and includes what Scribner and Merrill 1 

 and Hitchcock 2 referred to Chaetochloa composita. The typical form is rather robust 



1 U. S. Dept. Agr. Div. Agrost. Bull. 21: 27./. 15. 1900. 



2 Contr. U. S. Nat. Herb. 17: 263. 1913. 



Fig. 61. — Chaetochloa macrostachya. From Hitch- 

 cock 13605, Texas; slender-panicled form. 



