58 POACEAE 
the outermost one larger than the rest, membranous, exhaling a balsam-odor when fresh 
or when soaked in water, second scale shorter, thinner, somewhat rigid, acute, the third 
scale empty, or rarely in the sessile spikelets infolding a staminate flower, the fourth scale 
very thinly hyaline, in the sessile spikelets enclosing a perfect flower, in the pedicellate 
spikelets either empty or enclosing a staminate flower ; palet minute or wanting. Stamens 
3. Styles distinct. Stigmas plumose. 
1. Blionurus tripsacoides H. & B. Stems 6-15 dm. tall, from a rootstock, branched 
above: leaf-blades 5 dm. long or less, involute above the base when dry and about 0.8 
mm. in diameter, 3-5 mm. wide at the base, hirsute above near the base: racemes finally 
exserted, 7-14 cm. long, the rachis-internodes pilose excepting the inner surface : sessile 
spikelet 6.5-8 mm. long, about twice as long as the rachis-internode ; pedicellate spikelet 
5-6 mm. long, reaching or extending a little beyond the apex of the sessile spikelet, the 
pedicel pilose, excepting the inner surface. 
In low pine lands, Florida to Texas. Also in Mexico and South America. Summer and fall. 
8. SCHIZACHYRIUM Nees. 
Annual or perennial grasses, tufted, or from rootstocks, with flat or involute leaf-blades, 
and spike-like racemes, singly disposed, terminating the stem or its branches. Spikelets 
in pairs at each node of the articulated and frequently hairy rachis, one sessile, the other 
pedicellate. Sessile spikelet of 4 scales, the outer 2 indurated, sometimes pubescent, the 
remainder of the scales hyaline, the fourth scale entire or 2-toothed at the apex, bearing a 
straight, contorted or spiral awn; palet small, hyaline.  Pedicellate spikelet sterile, of 1 
or 2 scales, or wanting. Stamens1-3. Styles distinct. Stigmas plumose. BEARD GRASS. 
Internodes of the racemes glabrous, or merely shortly appressed-pubescent on 
the back, the racemes hence appearing naked. 
Internodes as well as the first scale of the sessile spikelet glabrous. 
Sessile spikelet 5-6 mm. long; pedicel stout, oblong-elliptic, the outer mar- 
gin ciliate its entire length. 1. S. semibcrbe. 
Sessile spikelet 4 mm. long; pedicel slender, linear, the outer margin ciliate 
only at the apex. 2. S. tenerum. 
Internodes as well as the first scale of the sessile spikelet appressed-pubes- 
cent. 3. S. oligostachyum. 
Internodes of the racemes and the pedicels long-ciliate on the margins, the in- 
ner or usually both surfaces glabrous, the racemes hence appearing hairy. 
Leaf-blades flat and broad; rachis-internodes and pedicels glabrous on the 
back, or the former rarely sparsely pilose at the summit, the marginal 
hairs much shorter than the respective organs. 
Stems tufted, no stolons. 
Sheaths and leaf-blades glabrous or sometimes sparingly pubescent. 
Spikelets 5-7 mm. long. 
Spikelets 10 mm. long. 
Sheaths and leaf-blades densely long-villous. 
Stems not tufted, stoloniferous, rootstocks long and slender. 
Pedicellate spikelet staminate: lower sheaths numerous, crowded, the 
blades spreading. 7. S. maritimum. 
Danes teres spikelet sterile: lower sheaths few, not crowded, the blades 
erect. 
Sessile spikelet 6-7 mm. long, the first scale strongly tuberculate- 
roughened ; pedicellate spikelet of a single scale, about 3mm. : 
long, single-awned. 8. S. stoloniferum. 
Sessile spikelet 9-10 mm. long, the first scale smooth or nearly so; 
pedicellate spikelet of 2 scales, 6-8 mm. long, the first scale 3- 
. S. scoparium. 
ES. acuminatum. 
. S. villosissimum. 
oO 
awned. 9. S. triaristatum. 
Leaf-blades involute, filiform ; rachis-internodes and pedicels strongly pilose 
on the back, the marginal and dorsal hairs much longer than the re- 
spective members. 10. S. gracile. 
1. Schizachyrium semibérbe Nees. Smooth and glabrous. Stems tufted, 6-12 dm. 
tall, the branches in 1’s or 2’s: leaf-blades 3 dm. long or less, 2-5 mm. wide: racemes 
single, 5-8 cm. long, partially included at the base, the rachis-internodes with a dense 
ring of short hairs at the base, thick, channeled on the inner surface : sessile spikelet 5-6 
mm. long, the first scale rounded on the back, roughened, acuminate, the awn of the fourth 
scale 12-15 mm. long, geniculate, tightly spiral at the base, the column exserted ; pedicel- 
late spikelet consisting of a single hispidulous scale about 3 mm. long with an equally long 
awn, the pedicel stout, oblong-elliptic, ciliate on the outer margin, shorter than the inter- 
node. [Andropogon semiberbis (Nees) Kunth. ] 
In dry rocky or sandy ground, southern peninsular Florida. Also tropical America. Summer. 
2. Schizachyrium ténerum Nees. Smooth and glabrous. Stems tufted, slender, 
often weak and decumbent, 4-10 dm. long, the branches in 1’s or Xs: leaf-blades 2 dm. 
long or less, 0.5-2 mm. wide, the lower ones often sparingly hirsute above near the base: 
racemes single, 3-6 em. long, the rachis-internodes with a ring of hairs at the base, stout, 
