102 NORTH AMERICAN FLORA [VoruME 17 
Pollinia vaginata Spreng. Pugill.2: 11. 1815. 
Pollinia brevifolia Spreng. Pugill. 2: 13. 1815. 
Andropogon ienellus J. Presi, in Presl, Rel. Haenk. 1: 335. 1830. 
Andropogon floridus Trin. Mém. Acad. St. Petersb. VI. 2: 265. 1832. 
Andropogon debilis Kunth, Enum. 1: 488, 1833. 
Sorgum brevifolium Kuntze, Rev. Gen. 791. 1891. 
A low spreading annual, with branching decumbent stems, and short obtuse leaf- 
blades. Stems up to 5 dm. long, slender, somewhat flattened, smooth and glabrous, finally 
prostrate at the base; leaf-sheaths compressed, the lower ones much shorter than the internodes; 
blades linear, usually obtuse, often folded, glabrous, those on the main stem up to 5 cm. long 
and 5 mm. wide; spike-like racemes 1.5-3 cm. long, usually included at the base, the inter- 
nodes of the rachis and the pedicels hispidulous on the angles; sessile spikelet 3.5-4 mm. long, 
the first scale lanceolate, acuminate, rough, hispidulous on the keels, the fourth scale cleft 
nearly to the base, the awn 8-15 mm. long, geniculate, the column spiral, from a little shorter 
than to one half the length of the subula; pedicellate spikelet usually reduced to a single scale 
1-1.5 mm. long and bearing an awn 4-5 mm. long. 
TYPE LOCALITY : Jamaica. 
DISTRIBUTION: Tropical America; also in tropical and subtropical regions elsewhere. 
ILLUSTRATION: Kunth, Rév. Gram. p/. 196. 
2. Schizachyrium Gaumeri Nash, sp. nov. 
A tufted annual with erect branching stems. Stems 3-4 dm. tall, smooth and glabrous, 
somewhat compressed; leaf-sheaths compressed, keeled, the lower ones overlapping; ligules 
scarious, ciliolate, 1.5-2 mm. long; blades flat, 3-12 cm. long, 3~4 mm. wide, acuminate; 
spike-like racemes 3-5 cm. long, usually included at the base, the internodes of the straight 
rachis glabrous, with a broad deeply 2-toothed hyaline apex, the pedicels sparsely long-hairy 
on the outer margin; sessile spikelet 4-5 mm. long, the first scale lanceolate, papillose-rough- 
ened, hispidulous on the keels, acute at the usually bifid apex, the second scale a little shorter, 
acute, 1-nerved, the keel hispidulous, the third scale about as long as the second, ciliate, the 
fourth scale 2-cleft almost to the base, ciliate, the awn 12-15 mm. long, geniculate, the tightly 
spiral column much exserted, equaling or a little shorter than the subula; pedicellate spikelet 
usually reduced to a single scale, 2-3 mm. long, with an awn 3-4 mm. long. 
Type collected at Izamal, Yucatan, G. /. Gaumer 1037 (herb. N. Y. Bot, Gard.). 
DISTRIBUTION : Known only from the type locality. 
3. Schizachyrium malacostachyum (J. Presl) Nash. 
Andropogon malacostachyus J. Presl, in Presl, Rel. Haenk.1: 337. 1830. 
Sorgum malacostachyum Kuntze, Rev. Gen. 792, 1891. 
Stems erect, up to 2.5 dm. tall, glabrous, branching, the branches short, simple, single or 
in pairs; leaf-blades up to 5 cm. long, 3-4 mm. wide, glabrous, smooth, except on the margins 
and keel; spike-like racemes 3—4 cm. long, of 8-12 internodes, so densely clothed with long white 
hairs that the spikelets are almost concealed, often entirely enveloped by the brown spathe, 
the internodes shorter than the sessile spikelets, with the margins and back densely clothed with 
long white hairs, except on the lower third, the pedicels shorter than the sessile spikelets; 
sessile spikelet about 5 mm. long, linear-oblong, the first scale white-villous on the back, the 
margins broadly infolded, obscurely 2-nerved in addition to the keels, the second scale 1-nerved, 
the fourth scale 2-cleft almost to the base, the awn about 1.5 cm. long, the column deep-brown, 
shortly exserted, about one third shorter than the subula which is somewhat contorted at the 
brownish base; pedicellate spikelet of 1 scale, 2-2.5 mm. long, lanceolate-subulate, bearing 
an awn about 5 mm. long. 
TYPE LOCALITY: Acapulco, Guerrero, 
DISTRIBUTION : Guerrero to Costa Rica. 
4. Schizachyrium Myosurus (J. Pres!) Nees, Linnaea 19: 695. 1847, 
Andropogon Myosurus J. Presi, in Presl, Rel. Haenk. 1: 337. 1830. 
Sorgum Myosurus Kuntze, Rev. Gen. 792. 1891. 
Stems slender, 7-10 dm. tall, branching, the branches in 2’s—4’s, simple or branched; 
leaf-sheaths glabrous, compressed, keeled; blades linear, acute, up to 12 cm. long, 3-4 mm. 
