106 NORTH AMERICAN FLORA [Volume 17 
with long hairs; sessile spikelet 3.5-5 mm. long, linear to lanceolate, smooth and glabrous, the 
outer scales keeled, otherwise nerveless, the first scale hispidulous on the keels toward 
the apex, the second scale hispidulous on the keel, the fourth scale 2-cleft nearly to the base, 
the awn 1-1.5 cm. long, the deep-brown closely spiral column usually much exserted, some- 
times just emerging, a little shorter than the yellowish subula which is contorted or somewhat 
loosely spiral below; pedicellate spikelet commonly reduced to a single 2-nerved scale 1-2 
mm. long which sometimes bears a short awn. 
TYPE LOCALITY: Near Ibagué, Colombia. 
DISTRIBUTION: Continental tropical America, and in the West Indies as far north as 
Guadeloupe. 
13. Schizachyrium Muelleri Nash, sp. nov. 
A tall stout perennial, with intravaginal innovations, flat leaf-blades, and a dense mamy- 
branched inflorescence. Stents up to 1 m. tall, much-branched above, the branches again sub- 
divided 2 or 3 times; leaf-sheaths roughish, keeled; blades up to 3 dm. long, 3-5 mm. wide, 
smooth and glabrous; inflorescence dense, corymbiform; spike-like racemes 1.5—2 cm. long, 
usually partially included at the base in the tightly inrolled spathe, the rachis straight or 
somewhat flexuous, the internodes about one half as long as the sessile spikelets, ciliate on the 
margins with long ascending hairs which are about two and a half times their length, the pedi- 
cels about as long as the sessile spikelets, ciliate with hairs about as long as those on the inter- 
nodes; sessile spikelet 4.5-5 mm. long, lanceolate, the first scale commonly 2-nerved in addi- 
tion to the keels which are hispidulous above, the infolded margins rather narrow, the second 
scale about as long as the first, acute, the third scale violet-tinted, the fourth scale entire or 
shortly bifid at the apex, the awn 10-12 mm. long, hardly geniculate, the brown column 
loosely spiral, but little exserted, much shorter than the subula which is a little twisted below; 
pedicellate spikelet of a single scale, awnless, or sometimes with an awn 2-3 times its length. 
Type collected at Vera Cruz, Mexico, 1855, Fred. Miller 2176 (herb. Columbia Univ.). 
DISTRIBUTION : Known only from the type locality. 
14. Schizachyrium scoparium (Michx.) Nash, in Small, Fl. SE. 
U.S. 59. 1903. 
Andropogon scoparius Michx. Fl. Bor. Am. 1:57. 1803. 
Andropogon purpurascens Muhl.; Willd. Sp. Pl. 4: 913. 1806. 
Andropogon flexilis Bosc ; Poir. in Lam. Encyc. Suppl. 1: 583. 1810. 
? Andropogon lolioides Fourn. Mex. Pl. Gram. 62. 1881. 
Andropogon scoparius maritimus divergens Hack. in DC. Monog. Phan. 6: 385. 1889. 
Sorgum scoparium Kuntze, Rev. Gen. 792. 1891. 
Andropogon scoparius polycladus Scribn. & Ball, Bull. U. S. Dep. Agr. Agrost. 24:40. 1901. 
Andropogon scoparius villosissimus Kearney ; Scribn. & Ball, Bull. U.S. Dep. Agr. Agrost. 24: 
41. 1901. 
Schizachyrium villosissimum Nash, in Small, Fl. SE. U. S. 59. 1903. 
A green or purplish, rarely glaucous, extremely variable, tufted perennial, with extra- 
vaginal innovations. Stems 4.5-15 dm. tall, the branches in 1’s—4’s and often subdivided; 
leaf-sheaths glabrous or pubescent, keeled, smooth or rough; blades 5 dm. long or less, up to 
8 mm. wide, glabrous or pubescent; racemes 2-6 cm. long, the rachis straight or flexuous, the 
internodes from one half as long as the sessile spikelets to equaling them, straight or curved, 
ciliate with grayish hairs on the margins throughout or on the upper portion only, those at 
the apex 1-3 mm. long, sometimes hispidulous on the back, the pedicels erect or recurved, 
shorter than the sessile spikelets, usually glabrous below, ciliate above with long grayish 
hairs; sessile spikelet commonly 5-7 mm. long, rarely shorter or longer, the first scale often 
more or less roughened, the fourth scale entire or 2-toothed for one quarter of its length, the 
awn geniculate, 8-15 mm. long, the column closely or loosely spiral, included or exserted; 
pedicellate spikelet 2~6 mm. long, usually small, consisting of 1 or 2 scales and empty, very 
rarely nearly as large as the sessile spikelet and staminate. 
TYPE Locatity: Carolina. 
DISTRIBUTION : Maine and Vermont to Saskatchewan, Montana, and Washington, and south 
to Florida, Texas, and New Mexico. 
ILLUSTRATIONS ! Vasey, Agr. Grasses U. S. fae 25; 2. pl. 27; Bull. Tenn, Exp. Sta. 7: pi. 
2,f.6,; Bull. U. S. Dep. - Agrost. 3: vy 9; T:f. 13; 15: 7.6; Britt. & Brown, Ill. Fl. f. 216; 
Bull. U. S. Dep. Agr. Bot. 1: Al. 4; 6: pi. 
