HITCHCOCK AND CHASE NORTH AMERICAN PANICUM. 205 



Louisiana: Calhoun, Ball 53; Hitchcock 1278, 1287; Shreveport, Cocks 3508; 

 Mandeville, Langlois 42; Abbeville, Langlois 38; Lake Charles, Chase 4400, 

 Hitchcock .1136, 1138, 1156, 1165. 



Texas: Waller County, Hitchcock 1202, 1203, 1215; Thurow 3, 4, 12, 13, 14, 16, 

 19, 20, 24, 26, 27, 28, 29, 33; Columbia, Bush 178; Weatherford, Tracy 7944, 

 7947; La Grange, Plank 97; Huntsville, Plank 63; Gladewater, Reverchon 

 2357; Ennis, Smith in 1897; Kerrville, Heller 1752, 1888; Houston, Bebb 

 1276; Denison, Pe&6 1428; New Braunfels, Lindheimer 565; Fort Smith to 

 the Rio Grande, Bigclow; without locality, Nealley in 1884 and 1888. 



Oklahoma: Poteau, Hitchcock 551; without locality, Palmer 384 in 1868. 



New Mexico: Without locality, Wright 2088, 2085 (the latter in Gray Herb.). 



California: Three Rivers, Coville <fc Funston 1286; Sacramento, Michener 142. 



118. Panicum leucothrix Nash. 



Panicum leucothrix Nash, Bull. Torrey Club 24: 41. 1897. "Type collected by 

 the writer in the low pine land at Eustis, Lake County, Florida, in the latter part of 

 July, 1894, no. 1338." The type, in Nash's herbarium, consists of somewhat branch- 

 ing primary culms, decumbent at base. The description reads: "Spikelets obovate, 

 about 0.65 mm. long, 0.4 mm. wide." This is evidently an error, as the spikelets of 

 the type measure 1*2 mm. as do also those of Nash 334 and 467 cited with the descrip- 

 tion. 



Panicum parvispiculum Nash, Bull. Torrey Club 24 : 347. 1897. "Type collected 

 by Dr. John K. Small at Darien Junction, Mcintosh Co., Ga., June 25-27, 1895." 

 The type, in Nash's herbarium, consists of a tuft of mature vernal culms, beginning 

 to branch. The culms and sheaths are appressed-pubescent, though less copiously 

 bo than is the type of P. leucothrix, and the panicles are larger. In the description 

 the spikelets are given as 1.5 mm. long, but those of the type measure 1.3 mm. 



DESCRIPTION. 



Vernal plants light olive green, often purplish tinged; culms tufted, 25 to 45 cm. 



high, erect or ascending, appressed papillose pilose, the nodes scarcely swollen, 



pubescent; sheaths shorter than the internodes, papillose-pubescent, the hairs less 



appressed than those of the culm, rarely nearly glabrous, the margins ciliate, densely 



so at the summit; ligules 3 mm. long; blades rather firm, ascending or spreading, 3 to 



7 cm. long, 3 to 7 mm. wide, rounded and papillose-ciliate 



at the base, glabrous or rarely sparsely villous on the upper 



surface, velvety puberulent beneath; panicles long-exserted, 



3 to 8 cm. long, about three-fourths as wide, rather densely 



flowered, the axis appressed-pubescent, with tufts of long 



hairs in the axils, the branches ascending; spikelets 1.2 to 



1.3 mm. long, 0.7 mm. wide, obovate-elliptic, densely 



From type specimen. .... , ° „ . , „ Jr _ , , ; 



papillose-pubescent; first glume about one-fourth the length 



of the spikelet, obtuse; second glume and sterile lemma equaling the fruit but not 



exceeding it; fruit 1.1 mm. long, 0.6 mm. wide, elliptic, slightly pointed. 



Autumnal form ascending, usually decumbent at base, at first sending out from 

 the lower and middle nodes long branches similar to the vernal culms, later pro- 

 ducing appressed, more or less fascicled branchlets, the flat or somewhat involute 

 blades not greatly reduced. 



The less copious pubescence and larger panicles of the type of P. parvispiculum 

 prove not to be correlated. A specimen of Nash 467 cited in the description of P. 

 leucothrix has one panicle 8 cm. long as in the type of P. parvispiculum, and six small 



