194 CONTRIBUTIONS FROM THE NATIONAL BERBARIUM. 



DESCRIPTION. 



Plants annual, often branched at base; culms as much as I meter tall, usually less 

 than 50 cm., glabrous, scabrous just below the panicle, the nodes glabrous or puberu- 

 lent; sheaths glabrous, the margin ciliate, the collar a more or less hispidulous ridge; 

 ligule a short, densely ciliate membrane; blades flat, rather thin, as much as 20 cm. 

 long and 2 cm. wide, usually about 1 cm. wide, narrowed toward both ends, scabrous, 

 especially beneath; panicles loosely flowered, cylindric, tapering at each end, often 

 nodding or flexuous, as much as 30 cm. long, usually 10 to 20 cm., the axis angled or 

 channeled, scabrous or scabrous-hispidulous; branches ascending, loosely arranged, 

 scabrous like the axis, as much as 2.5 cm. long; branchlets less than 1 mm. long, bearing 

 one bristle below each spikelet; bristles slender, flexuous, antrorsely scabrous, 7 to 1 5 

 mm. long; spikelets ovate, about 2 mm. long, rather turgid on the convex side, rather 

 prominently nerved; first glume one-third or one-fourth as long as the spikelet, 

 3-nerved; second glume about four-fifths as long as the fertile lemma, 5-nerved, with 

 an additional accessory pair on the outside; sterile lemma as long as the fertile, 

 5-nerved, with an accessory pair like the second glume, the palea wanting; fertile 

 lemma somewhat pointed, gibbous, coarsely and strongly transversely rugose. 



DISTRIBUTION. 



Open sandy or rocky soil, Arizona to Oaxaca. 

 Arizona: Tucson. Thornier 171 (N. Y. Bot. Gard. Herb.). 

 Lower California: Arroyo San Lazaro, Brandegee in 1902. San Jose del Cabo, 



Brandegee 12 in 1890. 

 Sonora: Alamos, Palmer 686 in 1890. Guaymas, Hitchcock 3548; Palmer 191 in 1887. 



Hermosillo, Hitchcock 3607. 

 Chihuahua: Batopilas, Palmer 52 and HOD in 1885. 

 Sinaloa: Rosario, Rose 1840. Culiacan, Palmer 1541 in 1891; Brandegee in 1904. 



Topolobampo, Palmer 233 in 1897. 

 Tepic: Acaponeta, Rose 3303. 

 Veracruz: Banos del Carrizal, Purpus 6211. 



Colima: Colima, Palmer 8 and 142 in 1897. Manzanillo, Hitchcock 7026; Orcutt 4481. 

 Guerrero: Balsas, Hitchcock 6774, 6786; Orcutt 4194. 

 Oaxaca: Tomellin, Hitchcock 6191. Between San Geronimo and La Venta, Nelson 



2788. 

 Nicaragua: Masaya, Hitchcock 8661. San Juan del Sur, Hitchcock 8599. 



19. Chaetochloa latifolia Scribn. 



Chaetochloa latifolia Scribn. TJ. S. Dept. Agr. Div. Agrost. Bull. 1 1 : 44. pi. 3. 1898. 

 " Growing under bushes in deep ravines, Diirango, Mexico (No. 879, E. Palmer, 1896 

 The type specimen,' in the National Herbarium, is shown in plate 3, which, however, 

 exaggerates the nerving and hispidity of the leaves. The type sheet includes two 

 other specimens. 



Chaetochloa latifolia breviseta Scribn. & Merr. U. S. Dept. Agr. Div. Agrost. Bull. 

 21: 31. 1900. The first specimen cited, "Mexico: Oaxaca, 347 Conzatti & Gonzalez, 

 1897," in the National Herbarium, is marked "type" in Merrill's hand. This form 

 has shorter and fewer bristles but is otherwise the same as the typical form. 



Setaria latifolia Herrm. Beitr. Biol. Pflanz. 10: 55. 1910. Presumably based on 

 Chaetochloa latifolia Scribn. No synonym is cited, but Scribner's name is given in 

 parentheses. 



DESCRIPTION. 



Plants annual, branching at the base; culms erect or geniculate-spreading, 20 to 



40 cm. tall, more or less scabrous, especially below the hispidulous or pubescent nodes 

 and below the panicle; sheaths papillose-hispid, papillose only, or glabrate, densely 



