POACEAE 59 
channeled on the inner surface: sessile spikelet about 4 mm. long, the first scale somewhat 
rounded on the back, acute, the awn of the fourth scale 7-10 mm. long, geniculate, tightly 
spiral at the base, the column exserted; pedicellate spikelet consisting of a single scale, 
4-5 mm. long, awnless or awn-pointed, the pedicel linear, not stout, pilose on the outer 
side near the summit, usually equalling or a little exceeding the internode. [Andropogon 
tener (Nees) Kunth. ] 
In dry ground, South Carolina to Florida and southern Texas. Also in tropical America. Fall. 
3. Schizachyrium oligostachyum (Chapm.) Nash. Smooth and glabrous, some- 
times glaucous. Stems 9-15 dm. tall, the branches in 1’s or 2’s: leaf-blades 2 dm. long or 
less, 4 mm. wide or less: racemes single, usually partially included at the base, 6-10 cm. 
long: sessile spikelet about 6 mm. long, about as long as or a little exceeding the hirsute 
rachis-internode, the first scale hirsute, the geniculate awn of the fourth scale 10-12 min. 
long, closely spiral at the base, the column considerably exserted ; pedicellate spikelet 
4-5 mm. long, the first scale glabrous, bearing an awn about 2 mm. long. [Andropogon 
oligostachyus Chapm. ] 
In dry sandy soil, Florida. Fall. 
4. Schizachyrium scoparium (Michx.) Nash. Green or purplish, sometimes 
glaucous. Stems tufted, 4.5-15 dm. tall, the branches in 1’s-4’s: leaf-sheaths usually 
glabrous, sometimes more or less hirsute; blades 5 dm. long or less, 8 mm. wide or less, 
commonly roughened, and frequently somewhat hirsute above near the base: racemes 
single, 3-6 cm. long, the hairs on the rachis-internodes and pedicels grayish white : ses- 
sile spikelet 5-7 mm. long, usually about twice as long as the internode, the first scale 
generally more or less tuberculate-roughened, the awn of the fourth scale geniculate, 
8-15 mm. long, closely spiral at the base, the column exserted ; pedicellate spikelet 2-4.5 
mm. long, the first scale usually glabrous, tipped with an awn generally 1 mm. long or less, 
the pedicel considerally shorter than the sessile spikelet. [Andropogon scoparius Michx. ] 
In dry sandy soil, New Brunswick to Alberta, Florida and Texas. Summer and Fall. BROOM GRASS. 
5. Schizachyrium acuminatum Nash. Stems tufted, 7-10 dm. tall, the branches 
in I's-3's: leaf-sheaths generally rough toward the summit, compressed, keeled ; blades 
2 dm. long or less, 5 mm. wide or less, rough: racemes single, finally exserted, 3-6 cm. 
long, the hairs of the rachis-internodes and pedicels grayish white: sessile spikelet 1 cm. 
long, about twice the length of the internode, the awn about 1.5 cm. long, geniculate ; 
pedicellate spikelet consisting of 2 scales, the first 4-5 mm. long, strongly hispidulous and 
bearing an awn 2 mm. long or less, the pedicel about 2 as long as the sessile spikelet. 
In dry soil, Mississippi. Fall. i 
6. Schizachyrium villosíssimum (Kearn.) Nash. Leaf-sheaths, and blades on both 
surfaces, densely villous. Stems tufted, 8-10 dm. tall, rather stout : leaf-blades 3.5 dm. long 
or less, 3-5 mm. wide, erect, rather firm : racemes single, about 3 em. long, exserted from 
the spathes which are more or less villous: sessile spikelet about 6.5 mm. long, the first 
scale tuberculate-roughened, acuminate, the awn of the fourth scale usually geniculate and 
more or less contorted, 10-13 mm. long, tightly spiral at the base, the column exserted ; 
pedicellate spikelet consisting of a single scale about 2 mm. long with an awn 1-2 mm. 
long, the pedicel recurved, at least when dry, shorter than the sessile spikelet, pilose above 
the middle with white hairs, glabrous below. [Andropogon scoparius villosissimus Kearn. ] 
In dry sandy soil, Mississippi. Fall. 
7. Schizachyrium marítimum (Chapm.) Nash. Smooth and glabrous, glaucous. 
Stems 4-6 dm. tall: leaf-sheaths compressed, keeled, the lower ones crowded and over- 
lapping ; blades 1 dm. long or less, 4 mm. broad or less, widely spreading : racemes 
single, usually partially included at the base, 3-4 cm. long, rather stout, the terminal hairs 
of the internodes of the rachis 5-7 mm. long: sessile spikelet 8-9 mm. long, about twice 
as long as the internodes, the awn twisted at the base, geniculate, 9-13 mm. long; pedicel- 
late spikelet 5-7 mm. long, awnless, consisting of four scales, the outer two acuminate and 
usually awn-pointed, the fourth scale enclosing a staminate flower, the pedicel about 4 as 
long as the sessile spikelet. [Andropogon maritimus Chapm. ] 
Along the seacoast, western Florida to Mississippi. Fall. 
8. Schizachyrium stoloniferum Nash. Stems 6-10 dm. tall, stoloniferous: leaf- 
sheaths keeled, more or less hirsute on the margins near the summit ; blades 2 dm. long 
or less, 2-5 mm. wide, smooth beneath, rough above and hirsute near the base: racemes 
single, 3-4 cm. long: sessile spikelet 6-7 mm. long, acuminate, about twice as long as the 
rachis-internode, the first scale strongly tuberculate-roughened, the awn of the fourth scale 
geniculate, more or less contorted, 8-10 mm. long, spiral at the base, the column not ex- 
serted ; pedicellate spikelet of a single scale about 3 mm. long, hispidulous, bearing an 
awn shorter than itself. 
In sandy soil, western Florida. Fall. 
