10 
§ 1. SCHIZACHYRIUM,. 
Racemes slender, solitary, terminal, on long peduncles; the thickened 
joints of the rachis with a cup or tooth-like appendage at the apex ; 
flowering glume often cleft nearly to the base, awned from between the 
divisions. 
1. A hirtiflorus Kth. var. rEENsis Hack. in DC. Monogr. Phan. vi. 372. Culms 
2 to 3 feet high, the upper half giving out lateral branches, smooth; radical leaves 
narrow, flat or conduplicate, 4 to 6 inches long, acuminate, scabrous, sparsely hairy 
below; culm leaves similar, the upper sheaths inclosing lateral branches; racemes 4 
to 5, about 3 inches long, of 10 to 13 joints; rachis villose; sessile spikeJet 5 lines long ; 
first glume linear lanceolate, acuminate, scabrous on the back and sparsely hairy ; 
second glume glabrous; third glume hyaline, one-third shorter than the second, 
parted nearly to the base, twisted awn between the lobes; fourth glume as long and 
very narrow.— Arizona and Mexico, 
Var. OLIGOSTACHYUS Hack. in DC. Monogr. Phan. vi. p. 372. (Andropogon oligo- 
stachyus Chapm. FI. 8. States, p. 581.) Racemes 2 to 24 inches long, with 10 to 15 
joints, more slender; joints at apex lousely pilose; first glume entire or minutely 
2-toothed, with scattered pubescence.—Middle Florida and Arizona, 
2, A cirrhatus Hack. in Flora, 1885, p. 119. (Vasey, Grasses of the Southwest, Pl. 
XVII.) Culms 2 to 24 feet high, slender, branching from the upper joints; peduncles 14 
to 3 inches long; leaves 3 to 5 inches long, erect; sheaths smooth ; racemes 3 to 5, 1 to 
24 inches long, with about 10 joints, peduneles and rachis smooth or nearly so; sessile 
spikelet 3 to 34 lines long, smooth; first glume 7- to 9-nerved ; second glume rather 
shorter, membranaceous, l-nerved, scabrous on the keel; third and fourth glumes 
hyaline, the fourth cleft three-fourths to base. 
3. Atener Kth. (Chapm. Fl. 8. States, p. 581.) Culms 2 to 3 feet long, filiform, 
like the smooth soon involute leaves; spikes slender, terete, 1 to 2 inches long, with ~ 
the joints bearded at base, otherwise smooth; spikelets appressed, half as long as the 
bent awn; glumes rough above; pedicel of the awnless neutral flower beaded at the 
apex.—Georgia, Florida and westward to Texas. 
4, A. scoparius Michx. (Gray’s Manual, 6th ed., p. 637.) Culms 2 to 4 feet high, 
somewhat compressed, with numerous branches either single or fascicled, sometimes 
again fasciculately branched, long exserted from the sheaths; spikes slender, 1 to 2 
inches long, loosely flowered, often purplish, with 5 to 10 joints; rachis generally 
zigzag when ripe, and with the sterile pedicels long ciliate above; sessile spikelets 
3 to 5 lines long; first glume acute, minutely scabrous, bidentate at apex, obscurely 
5-nerved; second glume membranaceous, acute, keeled, scarions and ciliate on mar- 
gin; third and fourth glumes scarious, fourth with awn 5 to 8 lines long. 
Var. MARITIMUS Hack. (A. maritimus Chapm.). ‘Panicle simple, racemose, 4 to 8 
inches long; spikes single, 8 to 10 flowered, very silky; spikelets larger in the 
species, outer glumes twice as long as the stout joints, and half as long as the twisted 
awbp” Chapman. Remarkable for its large glumes. 
5. A. semiberbis Kth. Enum. 1. p. 489. (Andropogon oligostachyus Chapm.). 
Culms rigid, erect, 2 to 3 feet high; leaves linear, smooth, glaucous; spikes 2 to 4 
inches long, erect, lower glume pubescent, one-half to one-third as long as the 
contorted awn; sterile flower neutral, short-awned.—Dry sandy ridges, middle 
Florida. 
This is Dr. Chapman’s description of his A. oligostachys, which Prof. Hackel refers to 
A, semiberbis var. pruinosua. 
6. A. gracilis Spreng. Sys. 1. p. 284. Culms cespitose, 1 foot to 18 inches high, 
slender; leaves filiform-setaceous, 2 to 4 inches long; spikes few, terminal and lat- 
eral, solitary, 1 to 14 inches long, the lateral distant on slender peduncles; rachis and 
pedicels silky-hairy; pedicellate spikelets reduced to a simple awned glume, outer 
glumes of fertile spikelet acuminate, 2 lines long, the fourth ¢lume shortly bifid, with 
an awn three to four times its own length.—Florida (No. 236, Dr. Garber). 
