HITCHCOCK AND CHASE—-NORTH AMERICAN PANICUM. 205 
Lourstana: 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, Bebb 1428; New Braunfels, Lindheimer 565; Fort Smith to 
the Rio Grande, Bigelow; without locality, Nealley in 1884 and 1888. 
OxiaHoma: Poteau, Hitchcock 551; without locality, Palmer 384 in 1868. 
New Mexico: Without locality, Wright 2088, 2085 (the latter in Gray Herb.). 
Cauirornia: Three Rivers, Coville & Funston 1286; Sacramento, Michener 142. 
/ 118. Panicum leucothrix Nash. 
Panicum leucothriz 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 
so than is the type of P. leucothriz, 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 
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 1.1mm. 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. 
leucothriz has one panicle 8 cm. long as in the type of P. parvispiculum, and six small 
Frq. 209.—P. leucothriz. 
From type specimen. 
