503 
* Lower glume more than one-half as long as the spikelet. 
10. P. tenerrimum Kth, Culms erect, very slender, 2 to 5 dm. high, branching 
and leafy at the base: leaves flat, 5 em. long or less, rather rigid; lower sheaths 
often pubescent: panicle about 1 dm. long; branches single, 1 to 3.cm. long: spike- 
lets 2mm. long; first glume glabrous, about one-half as long as the spikelet; per- 
feet floret smooth; lower floret neutral and without a palet.—Low land, Pecos 
County, Texas, rare, , 
ll. P. ciliatissimum Buckley. Culms decumbent, much branched, 2 to 4 dm. 
high, leafy, pilose at the nodes: leaves flat, 5 em. long; sheaths pubescent: panicle 
4 to 8 cm. long: spikelets 3 to 4 mm. long; first glume two-thirds as long as the 
spikelet; perfect floret rugose; lower floret staminate and with a palet.—Low land, . 
southern Texas to Florida, 
§5, Panicle linear or narrow; branches sessile, erect or appressed, or the apex spicate; 
spikelets nearly glabrous, short-pediceled.—SUBSPICATA. 
* Spikelets small (2 min, long), not turgid; perfect floret smooth, 
12. P. stenodes Griseb. Culms 6 to 10 dm. high, wiry, often branching above: 
leaves narrow, mostly involute, rigid and erect: panicle 6 to 9 em. long; branches 
alternate or in twos, unequal, the longer exceeding the intervals: spikelets lanceo- 
late, slightly more than 2 mm. long; outer glumes all acute, the first one-half as long 
as the second and third; these exceeding the floret.—In shallow water near the coast 
and extending along the Gulf to Florida. 
13. P. digitarioides Carpenter. Culms about 1 m. high, rooting at the lower 
nodes: panicle 1 to 2 dm. long, of 8 to 15 branches, single or rarely fascicled, the 
lower ones remote, 5 cm. long or less: spikelets ovate, 2 to 3 mm.long; glumes all 
acute, subcarinate; the first. one-half as long as the floret; the second and third 
equaling it. (2. Curtisii Chapm., not Steud.)—Ponds and swamps, eastern Texas and 
eastward. 
** Spikelets larger (2.5 to 5 mm. long), turgid. 
+ Perfect floret smooth. 
14. P. obtusum HBK. Culms 5 to 8 dm. high, branching, sending off long 
(sometimes 2 to 3m.) runners; stem and leaves rather rigid: panicle about 1 dm. long 
with 8 to 6 branches 5 cm, long or less: spikelets oblong or obovate, smooth, about 
3mm. long; 3 outer glumes subequal and nearly equaling the floret.—High plains 
of western and northern Texas. 
+ + Perfect floret transversely rugose. 
++ Spikelets subtended by a bristle. 
15. P. subspicatum Vasey. Culms3to5dm, high froma strong rootstock, branch- 
ing, leafy: leaves mostly flat: panicle 8 to 15 em. long, interrupted; branches short, 
appressed: spikelets little more than 2mm. long, ovate, curved, subacute, smooth; 
lower glume one-half as long as the spikelet; second and third glumes equaling the 
floret. —Southern and western Texas. 
16. P. Reverchoni Vasey. Culms 4 to6dm. high, erect, slender, from a thickened 
base: leaves mostly radical, narrow, involute: panicle 1 to 2dm. long, interrupted; 
branches few and short: spikelets ovate, 3 to4 mm. long, smooth; first glume deltoid, 
one-half as long as the spikelet; second and third glumes equaling the acute floret.— 
Plains of central and northern Texas. 
++ ++ No bristles in the panicle: empty glumes reticulately veined. 
17. P. Texanum Buckley. (TEXAS MILLET.) Culms about 1m. high, often decum- 
bent, branching and rooting below: leaves pubescent, 1 to 2cm. wide: panicle 1 to 
2dm. long, usually included at the base in the upper sheath; branches 8 em. long 
or less: spikelets broadly lanceolate, acute; glumes all acute; first one-half as long 
