11 



its infolded margins, acute, apiculate, 5-nerved, sulcate, subtending a broad, 

 hyaline palea of its own length; flowering glume elliptical-ovate, acute, striate, 

 finely transversely rugose for its whole length, the inclosed palea slightly convex 

 at the base, plane or concave above. 

 In moist soil, New Jersey to Florida and Texas, north to Kansas and Missouri; 



Mexico, West Indies, South America. May-October. 

 Specimens examined.— i\'<'?(' Jersey: Holmes 1890. North Carolina: Biltmore, 6026a 

 Biltmore Herb. 1898; no locality, McCarthy 1889. South Carolina: Santee Canal, 

 Ravenel. Georgia: Augusta, 200 Kearney 1895. Florida: Duval Co., 3614 Cur- 

 tiss 1883; Jacksonville, 4745 Curtiss 1894, 5411Curtiss 1895, 19 Combs 1898; Bay 

 Head, 659 Combs 1898; Cedar Key, 775 Combs 1898; Eustis, 566 Nash 1894. 

 Alabama: Mobile, 42, 58 Kearney 1895. Mimssippi: Chandeleur Island, Tracy 

 1897; Agricultural College, 34 Kearney 1896; Starkville, 22 Kearney 1896; Loui- 

 siana: New Orleans, 343 Kearney 1896; Oberlin, 218 Ball 1898; Pointe-a-la-Hache, 

 54 Langlois 1883. Indian Territory: Verdigris, 744 Bush 1894. Texas: Hamp- 

 stead, 840 Hall 1872; Bexar Co., 207 Jermy; Pinto Creek, Kinney Co., 82 Hill 1895; 

 Kerrville, 1889 Heller 1894; Home Canyon, 423 Carleton 1891 ; Houston, 15 Engel- 

 mann 1842; Ennis, Smith 1897; Dallas, Reverchon 1875; without locality, C. 

 Wright 1849; Nealley 1884; Reverchon 1879, 1883. Nerv Mexico: Drummond, 984 

 Fendler 1847. West. Indies: St. Thomas, 185 Eggers 1880. Cuba: 3888 Wright 

 1865. Puerto Rico: 208 Sintenis 1884. Mexico: 536 Gregg 1848-49; Cuicatlan, 

 1652 Nelson 1894; Guadalajara, 246 Palmer 1886. Lower California: San Jose del 

 Cabo, 15 Brandegee 1890. 

 Very readily distinguished from C. glauca (L.) Scribn., to which it has been referred 

 as a variety and with which it is confused, by its perennial roots, longer, glabrous 

 leaves, longer setse and smaller spikelets. 

 This variable species has long passed under the name Seiaria laevigata, but from care- 

 ful consideration it would seem that imberbis is the proper name. Trinius (Icon, 

 t. 196, Fig. A) says in his description of the plate that Fig. A is Setaria gracilis 

 Kunth, which can hardly be a synonym of Panicum imberbe Poir.,^ but below in 

 referring to the plate he calls Fig. A Setaria imberbis; hence the confusion regard- 

 ing this species. Poiret in his original description says that the specimens on 

 which he based this species were from Carolina, Puerto Rico, and Brazil, and 

 that they differed from Panicum glaucum of Europe not only in having the bris- 

 tles of the involucre longer, but also by the leaves being destitute of hairs at the 

 apex of the sheaths. 

 Chsetochloa gracilis, the slender form of Trinius t. 196, does not grow naturally north 

 of Texas, and, moreover, it can not be Poiret' s Panicum imberbe, as is seen from 

 the original description. 

 CH-fflTOCHLOA IMBERBIS PENICILLATA (Nees) n. comb. Panicum pen- 



icillcdum Nees. Agrost. Bras. 242 (1829). (Fig. 2.) 

 An erect or ascending perennial, sometimes rooting at the lower nodes, with panicles 

 3 to 12 cm. long, and long, widely spreading yellow, brown, or purplish setee, 

 otherwise as in the type. 

 In fields and pine woods Georgia to Texas, Mexico, and South America. 

 Specimens examined. — Georgia: Augusta, 227 Kearney 1895; Savannah, 186 Kear- 

 ney 1895. Florida: Waldo, 702 Combs 1898; Lake City, 83, 179 Combs & Rolfs 

 1899; Monticello, 346 Combs 1898; Old Town, 877 Combs 1898; Quincy, 396 

 Combs 1898; Apalachicola, 116 Kearney 1895.. Louisiana: Pointe-a-la-Hache, 

 55 Langlois 1880; Calhoun, 41 Ball 1898. Mississippi: Ocean Springs, 1105. Pol- 

 lard 1896; Biloxi, 217 Kearney 1896. Texas: Ennis, J. G. Smith 1897, without 

 locality; Hall 1872; Nealley 1887. 



^ Cujus syn. vix erit P. imberbe Poir. 



