26 
rooting at the lower joints; leaves linear-lanceolate, plane, rigid, 6 to 9 inches 
long, 6 to 9 lines wide, smooth; sheaths smooth or hairy; panicle slender, spike-like, 
6 to 8 inches long, of numerous appressed slender, single, or fascicled branches, the 
lower ones remote; spikelets ovate-lanceolate, acutish, about 1 line long; lower g!ume 
acute, keeled, half as long as the spikelet; the second a little shorter than the third, 
which equals the acutish perfect flower; second and third glumes strongly 3- to 5- 
nerved, sterile flower triandrous, Closely resembles the preceding.—Ponds and 
swamps, Florida to Texas. 
9. P. obtusum H. B. K. (Kunth Gram., . t. 116.) Culms 1} to 2 feet high, firm, 
leafy; sending off long (sometimes 8 to 10 feet) runners from the base; leaves 4 to 
6 inches long, 2 to 3 lines wide; panicle 3 or 4 inches long, narrow, composed of 
four to seven approximate, appressed, sessile branches, the lower ones about 1 inch 
long, the upper becoming very short, densely flowered ; spikelets mostly in alternate 
pairs, of which one is sessile, the other short-pediceled, forming three to four rows, 
turgid, oblong, obtuse, and 1} lines long ; lower glume two-thirds as long as the spike- 
let, S-nerved, second glume 7-nerved, third 5-nerved, a little longer than the fer- 
tile flower; sterile flower triandrous.—Mexico, Texas, New Mexico to Colorado, 
10. P. reticulatum Torr. Culms 10 to 15 inches high, much branched below, leafy; 
leaves 14 to 3 inches long, acute, scabrous or pubescent, as also are the sheaths ; 
panicle 2 to 3 inches long, lateral ones shorter, close or dense; branches single or 
fasciculate, unequal, 1} or 2 inches long, the longer with interrupted spikelets, which 
are about 14 lines long, single or in pairs, one sessile and one pediceled, obovate, 
acutish ; first glume one-fourth to one-third as long as the spikelet, acutish, second 
and third strongly 5- to 7-nerved, and conspicuously reticulately veined.—Texas 
to Arizona. 
11. P. Texanum Buckley. Culms stout, 2 to 4 feet high, branching from a decum- 
bent and sometimes rooting base, leafy, smooth; leaves lanceolate, 4 to 10 inches 
long, 6 to 12 lines wide, smoothish or scabrous above and on the margins ; sheaths 
softly and sparsely pubescent, nodes pubescent; panicle (the base generally inclosed 
in the upper sheath) 4 to 8 inches long, $ to 1 inch wide, of 5 to 10 erect, rather 
slender, simple, erect branches 1 to 3 inches long, closely flowered; rachis scabrous- 
pubescent; spikelets single or in pairs, alternate along the angular rachis, oblong, 
lanceolate, acute, 2 to 24 lines long, smooth, or finely pubescent; first glume broadly 
ovate, half to two-thirds as long as the spikelets, acute, 5-nerved; second and third 
glumes equaling the spikelet, strongly 5- to 7-nerved, perfect flower ovate or oblong- 
ovate, acutish, transversely wrinkled with fine reticulated striw. Cultivated for a 
forage grass.—Texas, 
12. P. Chapmani Vasey. Bull. Torr. Club, x1. p. 61. (P. tenuiculmum Chapm. 
non Meyer.) Culms filiform, 14 to 24 feet high, erect, simple; leaves chiefly radical, 
linear, half as long as the culm, about 2 lines wide, upper ones shorter; panicle 6 to 
12 inches long, of eight to twelve remote, slender, erect spikes, the upper ones short 
and few- (3- to 6-) flowered, sessile, one-half inch long, the lower longer, some- 
times subdivided, and with long, sheathed peduncles; rachis flexuous, bristle-like 
at the apex; spikelets about one line long, ovate; lower glume one-half as long as the 
spikelet, obtuse; upper glume 9-nerved.—Florida (Chapman, Curtiss, Garber). 
13. P. Reverchoni Vasey. (Dept. Agr. Bot. Div. Bull. No. 8, p. 25.) Culms fili- 
form from a thick, strong rootstock, erect, 10 to 18 inches high, simple; leaves 
chiefly radical, long and narrow, half as long as the culm; panicle 3 to 6 inches 
long, slender, an interrupted spike, at least above, below with short, 3- to 5-flowered, 
remote, fasciculate branches; spikelets 1} lines long, plano-convex, obtusish ; lower; 
glume one-half as long as the spikelet, 3-nerved, second and third 7-nerved 3 rachis 
terminated by a short bristle, sometimes also a bristle below the spikelets.—Texas - 
(Reverchon). Distributed by Reverchon as Setaria uniseta. 
14. P. subspicatum Vasey. (Dept. Agr. Bot. Div. Bull. No. 8, p. 25.) Culms 
10 to 18 inches high, leafy ; upper leaves longer than the lower (lowest Linch, highest 
5 inches), 1 to 3 lines wide, rather rigid, light green, acute; panicle spicate at apex, 
