Part 2, 1912] POACEAE 108 
wide, glabrous, smooth beneath, rough on the upper surface and on the margins; spathes 3.5—4 
cm. long; spike-like racemes 4-6 cm. long, slender, the rachis straight, the internodes equaling 
the sessile spikelets, about 1 mm. broad at the apex, the pedicels a little shorter than the 
internodes; sessile spikelet 4-5 mm. long, linear-oblong, the first scale coriaceous, obsoletely 
2-nerved in addition to the keels, densely clothed on the back, except the upper quarter, 
with white spreading hairs, the second scale equaling the first, membranous, acute, glabrous, 
the third and fourth also glabrous, the fourth bearing an awn 10-12 mm. long, barely exserted 
from the scales and eqttaling the subula; pedicellate spikelet about 2 mm. long, of 2 scales, 
the first scale with an awn about as long as itself. 
TYPE LOCALITY: Mexico. 
DISTRIBUTION: Mexico. 
ILLUSTRATION: Kunth, Rév. Gram. p/. 199. 
5. Schizachyrium semiglabrum Nash, sp. nov. 
A tufted perennial with intravaginal innovations. Stems 6-8 dm. tall, slender, smooth 
and glabrous, often glaucous, somewhat compressed, especially near the nodes, sparingly 
branched, the branches single from the upper axils; spike-like racemes 5-7 cm. long, straight, 
the rachis not flexuous, the internodes and the pedicels long-ciliate on one margin with ascend- 
ing hairs, the pedicels long-ciliate also on the outer margin near the apex, otherwise glabrous; 
sessile spikelet 8-9 mm. long and about 1 mm. wide, lanceolate, the first scale about 6-nerved, 
including the two hispidulous keels, rough toward the apex, hirsute below with long ascending 
hairs, the second scale rough below, hispidulous on the keel, acuminate, the third and fourth 
scales claret-colored, the fourth ciliate on the margins and deeply 2-toothed at the apex, bearing 
an awn about 1.5 cm. long, the column tightly spiral, brown, the subula hispidulous, purplish, 
slightly twisted below. 
Type collected in-the Sierra Madre, near Colonia Garcia, Chihuahua, Mexico, September 19, 
1899, C. H. T. Townsend & C. M. Barber 335 (herb. N. Y. Bot. Gard.). 
DISTRIBUTION : Known only from the type locality. 
6. Schizachyrium domingense (Spreng.) Nash. 
Streptachne domingensis Spreng.; Schultes, in R. & S. Syst. Veg. Mant. 2: 188. 1824. 
Arisida domingensis Kunth, Rév. Gram. 62. 1829. 
Schizachyrium hirtifiorum Nees, Agrost. Bras. 334, 1829, 
Andropogon hirtifiorus Kunth, Rév. Gram. 569. 1832. 
Andropogon oligostachyus Chapm. Fl. S. U.S. 581. 1860. 
Andropogon malacostachyus Fourn. Mex. Pl. Gram. 62. 1881. Not A. malacostachyus J. Presl, 1830. 
Andropogon feensis Fourn. Mex. Pl. Gram. 62. 1881. 
Andropogon hirtifiorus oligostachyus Hack. in DC. Monog. Phan. 6: 372. 1889. 
Andropogon hirtifiorus feensis Hack. in DC. Monog. Phan. 6: 372. 1889. 
Sorgum hirtiforum Kuntze, Rev. Gen. 792. 1891. 
Andropogon hirtiflorus brevipedicellatus Beal, Grasses N. Am. 2: 44. 1896, 
Schizachyrium oligostachyum Nash, in Small, Fl. SE. U.S. 59. 1903. 
A tufted perennial with intravaginal innovations. Stems smooth and glabrous, up to 
12 dm. tall, branching; leaf-sheaths keeled, glabrous, sometimes with a tuft of long hairs on 
each side at the apex, the lower ones sometimes hirsute; blades 1-2 dm. long, flat or complanate, 
commonly 3-4 mm. wide, smooth or rough, the upper surface sometimes with long hairs near 
the base, the margins near the base occasionally papillose-ciliate; spike-like racemes 4-12 cm. 
long, often included at the base, the rachis-internodes and the pedicels hirsute on the back 
and margins; sessile spikelet 7-9 mm. long, lanceolate, the first scale hirsute, smooth or 
rough, entire or bifid at the acute apex, the second scale glabrous, the fourth scale cleft to 
below the middle or nearly to the base, the teeth acute and usually ciliate, bearing an awn 
12-20 mm. long, geniculate, the spiral column shorter than the hispidulous subula; pedicellate 
spikelet 3-5 mm. long, hispid, bearing an awn equaling or shorter than itself. 
TYPE LOCALITY: Santo Domingo. 
DISTRIBUTION : Georgia and Florida; Texas to Arizona, and south to Chile and Paraguay ; 
Santo Domingo and Haiti. 
ILLUSTRATIONS: Kunth, Rév. Gram. pl. 198; Bull. U. S. Dep. Agr. Agrost.17: f. 3/1; Bull. 
U.S. Dep, Agr. Bot. 121: pl. 19; Field Columb. Mus. Publ. Bot. 3: 19, f. 
