HITCHCOCK REVISIONS OF NORTH AMERICAN GRASSES. 195 



ciliate; ligule a densely ciliate membrane less than 1 mm. long; blades flat, mostly 

 less than 10 cm. long, as much as 1.5 cm. wide, rounded or somewhat cordate at base, 

 rather abruptly narrowed at the apex, 

 scabrous and also sparsely papillose-his- 

 pid; panicles loosely cylindric, tapering 

 above, more or less interrupted or lobed, 

 mostly 5 to 8 cm. long, the axis sca- 

 brous or pubescent and also villous, the 

 hairs weak and spreading, 1 mm. long; 

 branches short, ascending, the longer as 

 much as 5 mm. long; branchlets about 1 

 mm. long, bearing a single bristle below 

 the spikelets; bristles flexuous, angled, 

 antrorsely scabrous, 5 to 10 mm. long; 

 spikelets about 2 mm. long or a little 

 longer, moderately turgid on the convex 

 side; first glume one-third the length of 

 the spikelet, 3-nerved; second glume a 

 little shorter than the fertile lemma, 5- 

 nerved; sterile lemma as long as the fer- 

 tile, 5-nerved, thepalea well developed; 

 fertile lemma strongly and coarsely trans- 

 versely rugose. 



DISTRIBUTION. 



Rocky hills and shady places, Durango 

 to Oaxaca; also in Brazil. 

 Durango: Durango, Palmer 470 and 879 



in 1896; Hitchcock 7643. 

 Oaxaca: Oaxaca, Conzatti & Gonzalez 



343; Hitchcock 6105. 

 Brazil: Piauhy, Gardner 2354. Fig. 53.— Chaetochloa latifolia. From type specimen. 



20. Chaetochloa macrosperma Scribn. & Merr. 



Chaetochloa macrosperma Scribn. & Merr. U. S. Dept. Agr. Div. Agrost. Bull. 21: 33. 

 /. IS. 1900. "Setaria composite of Chapman's Fl. So. IT. S. and of Bub 7: 85. fig. 67, 

 U. S. Dept. Agr., Div. Agros., not of H. B. K." No type is designated. In the 

 National Herbarium is a specimen bearing the name and marked "type" and bearing 

 also detailed drawings of the spikelet and a statement that the drawing (figure 18) 

 was made from this plant. This specimen, Curtiss 3617, collected on "Shell mounds 

 at the mouth of St. Johns River, Florida," is the first one cited by Scribner and 

 Merrill and may be accepted as the type. If one looks upon the publication of C 

 macrosperma as a change of name only, it would be based upon Setaria composita of 

 Chapman's Flora as cited above. In the National Herbarium is a specimen from 

 Chapman without locality, marked Setaria composita S. Fl.!, which represents the 

 latter species as understood by Chapman. 



Setaria macrosperma Schum. Just's Bot. Jahresb. 28 1 : 417. 1902. Based on 

 Chaetochloa macrosperma Scribn. & Merr. 



DESCRIPTION. 



Plants perennial, often in large tufts; culms usually more or less geniculate at base, 

 and often rooting at the lower nodes, smooth, scabrous below the panicle, rather 

 stout, mostly 1 to 1.5 meters tall, the nodes glabrous; sheaths keeled, glabrous, villous 



