Part 2, 1912] POACEAE 105 
10. Schizachyrium cirratum (Hack.) Nash. 
Andropogon cirratus Hack. Flora 68: 119. 1885. 
Sorgum cirratum Kuntze, Rev. Gen. 791. 1891. 
A tufted perennial with erect stems. Stems up to 7 dm. tall, somewhat branching, 
smooth and glabrous, terete; leaf-sheaths glabrous, shorter than the internodes; blades flat, 
or sometimes complanate, those on the innovations sometimes sparsely long-ciliate at the base, 
those on the stem up to 1.5 dm. long, 2-4 mm. wide; spike-like racemes 4-6 cm. long, usually 
exserted, the internodes of the rachis glabrous, or with a few hairs on the outer margin near the 
apex, the pedicels with the outer margin long-hairy near the apex; sessile spikelet 8-9 mm. 
long, including the hairy callus, the first scale lanceolate, rough, hispidulous on the keels, 
acute, the fourth scale cleft for two thirds to three fourths of its length, the teeth ciliate, the 
awn 13-20 mm. long, the spiral column about as long as the subula; pedice Ilate spikelet 6-8 
mm. long, usually enclosing a staminate flower. 
TYPE LOCALITY: Between eastern Texas and El Paso. 
DISTRIBUTION : Western Texas to Arizona, ean ae eae and Lower California. 
ILLUSTRATION: Bull. U.S. Dep. Agr. Bot. 121: pl, L 
11. Schizachyrium Schottii (Rupr.) Nash. 
Andropogon Schottii Rupr.; Hack. in Mart. Fl. Bras. 23: 299. 1883. 
Andropogon Schottit asperiglumis Hack. in DC. Monog. Phan. 6: 383. 1889. 
Sorgunt Schottii Kuntze, Rev. Gen. 792, 1891. 
Stems 4-8 dm. tall, slender, branched, the branches solitary at the nodes, simple; leaf- 
sheaths glabrous; blades 1-2 dm. long, 2-4 mm. wide, acute, glabrous, or ciliate at the very 
base, smooth, except the roughish margins; spathes 4-6 cm. long; spike-like racemes 
5-7 cm. long, slender, the internodes equaling the sessile spikelets, ciliate on the margins, 
except the upper one third, otherwise glabrous, the pedicels equaling the internodes 
but more slender, ciliate with long hairs; sessile spikelet about 7 mm. long, pale-green, the 
first scale firm, linear, acuminate, glabrous, obsoletely 3-nerved in addition to the keels, the 
second scale acute, 1-nerved, ciliate, the third scale also ciliate, the fourth scale 2-cleft nearly 
to the base, the awn about 1.5 cm. long, the column included or scarcely exserted from the 
scales and about half as long as the subula; pedicellate spikelet about 3 mm. long, with an 
awn shorter than itself. 
TYPE LOCALITY : Tocaia, Brazil. . 
DISTRIBUTION : Chihuahua (according to Hackel) ; also in Brazil. 
12. Schizachyrium condensatum (H.B.K.) Nees, Agrost. 
Bras. 333. 1829. 
Andropogon condensatus H.B.K. Nov. Gen. & Sp. 1:188. 1816. 
? Andropogon densus Desv.; Hamilt. Prodr. 8. 1825. 
? Andropogon microstachyus Desv.; Hamilt. Prodr. 8. 1825. 
? Deyeuxia spicata Spreng. Syst. 1: 254, 1825. 
Andropogon scoparius J. Presi, in Presl, Rel. Haenk. 1: 338. 1830. Not A. scoparius Michx. 1803. 
Andropogon paniculatus Kunth, Enum. 1: 494. 1833. 
Andropogon Benthamianus Stend. Syn. Gram. 382. 1854. 
Andropogon Lhotskyt Steud. Syn. Gram. 384. 1854. 
? Andropogon rectirhachis Fourn. Mex. Pl. Gram. 61. 1881. 
Andropogon condensatus corymbosus paniculatus Hack, in Mart. Fl. Bras, 23: 297. 1883. 
Andropogon condensatus elongatus Hack. in Mart. Fl. Bras. 2? : 297. 1883. 
Sorgum condensatum Kuntze, Rev. Gen. 791. 1891. 
A rather tall tufted perennial, with broad flat leaf-blades, and a corymbiform or long and 
narrow inflorescence. Stems stout, a little compressed, 3 dm. to 1 m. tall or more, the upper 
portion bearing few to many flowering branches; leaf-sheaths smooth and glabrous, sometimes 
glaucous, keeled, the basal ones and those on the innovations much compressed, equitant; 
ligule scarious, more or less lacerate, 2-4 mm. long; blades linear, acute, smooth and glabrous, 
strongly keeled on the lower surface, up to 2 dm. long and 5-10 mm. wide, those on the inno- 
vations often longer; inflorescence a dense corymbiform mass at the apex of the stem, or elon- 
gate and either narrow or broad; spike-like racemes 1-3 cm. long, included in the spathes or 
more or less exserted, the rachis usually flexuous, or occasionally straight, the internodes and 
pedicels from a little shorter to longer than the sessile spikelets, ciliate on the margins 
