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. 
ay @0ee nae 
DISTRIBUTION. 
Open sandy ground, Arkansas and 
Texas. 
Arxansas: Benton County, 
Plank 8. i 
Texas: Austin, Hall 824; Abilene, 
Tracy 7955; San Diego, Smith Fia. 366.—Distribution of P. ciliatissimum. 
_ 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. 
195. Panicum zizanioides H. B. K. BS 
Panicum oryzoides Swartz, Prodr. Veg. Ind. Occ. 23.1788, not Ard. 1764.“ Jamaica.” 
The type is in the Swartz a eciune. 
Panicum zizanioides H. B. K. Nov. Gen. & Sp. 1: 100. sis. ““Crescit in calidissimis 
regnt Novogranatensis, in ripa fluminis Magdalenx, 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. 
? Panicum balbisianum Schult. 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¢ refers this name. 
Panicum grandiflorum Trin.; Nees, Agrost. Bras. 143. 1829. This is given as a 
synonym of P. zizanioides and credited to “ Herb. Trini.’ No specimen so named 
was found in the Trinius Herbarium. 
Panicum pseudoryzoides Steud. Syn. Pl. Glum. 1: 75. 1854. The only specimen 
cited is ‘‘P. oryzoides Salzm. * * * Bahia.’’ A specimen of this was examined 
in the De Candolle Herbarium. 
@ Mart. I'l. Bras. fe 3: 2 1920 
