HITCHCOCK AND CHASE — NORTH AMERICAN PANICUM. 



325 



than the internodes; ligules densely hairy, less than 1 mm. long; blades 3 to 7 cm. 

 long, 3 to 5 mm. wide, tapering from near the rounded base to a sharp point, flat, 

 puberulent or glabrous, usually ciliate along the lower portion of the thick, white 

 margin; panicles finally long-exserted, 3 to 6 cm. long, rarely over 1 cm. wide, the 

 few, erect branches bearing approximate, short-pediceled spikelets, placed with the 

 back of the fruit turned from the rachis, that is the first glume toward the rachis'; 

 spikelets 4 mm. long, about 1.8 mm. wide, pointed; first glume three-fourths the length 

 of the spikelet or more, cuneate, 5-nerved, glabrous, or with a few silky hairs at the 

 very base; second glume and sterile lemma subequal, exceeding the fruit, 5-nerved, 

 the internerves densely silky pubescent, or in the lemma sometimes nearly glabrous, 

 the portion from the lateral nerves to the margins densely clothed with white and 

 glistening silky hairs, the sterile palea about two-thirds as long as its lemma; fruit 

 3 mm. long, about 1.6 mm. wide, ellipsoid, apiculate, transversely rugose. 



This species is somewhat doubtfully retained in Panicum. The racemose inflores- 

 cence and the reversed position of the silky, pointed spikelets show relationship 

 with Eriochloa, in which, however, 

 the first glume is nearly obsolete. It 

 is most nearly allied to Panicum cimi- 

 cinum (L.) Retz., an East Indian 

 species. 



DISTRIBUTION. 



Open sandy ground, Arkansas and 

 Texas. 



Arkansas: Benton County, 



Plank 8. 

 Texas: Austin, Hall 824; Abilene, 



Tracy 7955; San Diego, Smith 



in 1897; Pena, Nealley 31 in 



1891; Elsordo, Griffiths 6441, 6445; Torrecillas, Griffiths 6432 ; Encinal, Griffiths 



6381; western Texas, Buckley; without locality Nealley in 1887, 1889, and 



1892, Reverchon in 1885. 



Fig. 366.— Distribution of P. ciliatissimum. 



195. Panicum zizanioides H . B. K. 



Panicum oryzoides Swartz, Prodr. Veg. Ind. Occ. 23. 1788, not Ard. 1764. " Jamaica. " 

 The type is in the Swartz Herbarium. 



Panicum zizanioides H. B. K. Nov. Gen. & Sp. 1: 100. 1815. " Crescit in calidissimis 

 regni Novogranatensis, in ripa fluminis Magdalenge, inter Borjorque et Los Paxarales de 

 Sogamozo." The specimen of this in the Bonplond Herbarium is not from the pub- 

 lished locality, but "in calidissimis regni Mexicani prope Queretaro." A specimen 

 from Humboldt in the Willdenow Herbarium is from "Amer. merid," and may be 

 the type. 



t Panicum balbisianum Sclrult. Mant. 2: 254. 1824. Based on " Panicum aturense 

 Herb. Balbis n. 2578." " In S. Domingo. D. Bertero" is also cited. We have not 

 seen either of these specimens, but the description appears to apply to P. zizanioides 

 to which Doell a refers this name. 



Panicum grandiflorum Trin.; Nees, Agrost. Bras. 143. 1829. This is given as a 



synonym of P. zizanioides and credited to u Herb. 

 was found in the Trinius Herbarium. 



Panicum pseudoryzoides Steud. Syn. PI. Glum, 

 cited is "P. oryzoides Salzm. * * * Bahia." 

 in the De Candolle Herbarium. 



Trinii.^ No specimen so named 



1: 75. 1854. The only specimen 

 A specimen of this was examined 



a Mart. Fl. Bras. 2 2 : 228. 1877. 



