Part 1, 1909] POACEAE 93 
lanceolate, attenuate, the outer 2 scales long-hairy, more than one half the length of the 
basal hairs, the inner scales colored or uncolored, the fourth scale entire, or sometimes 
minutely 2-toothed, bearing a straight or somewhat flexuous awn 10-12 mm. long, the base 
not spiral, the enclosed flower cleistogamous. 
TYPE LOCALITY : Brazil. 
DISTRIBUTION : Mexico; also in South America. 
9. Erianthus jamaicensis (Trin.) cue Oefv. Sv. Vet.-Akad. 
Forh. 1855: . 1855. 
Saccharum jamaicense Trin. Mém. Acad. St. Petersb. VI. 2: 312. 1832. 
Erianthus Ravennae jamaicensis Hack. in DC. Monog. Phan. 6: 141. 1889. 
Stems 1-2 m. tall; leaf-sheaths silky-villous on the inside; blades up to 6 dm. long 
and 6 mm. broad, very acuminate, glaucous beneath, the upper surface and the margins 
rough ; panicle 2 dm. long, linear-lanceolate, the axis somewhat flexuous and roughened, 
the internodes a little longer than the pedicels and shorter than the spikelets, slender, 
linear, furnished with hairs longer than themselves; spikelets 5.5-6 mm. long, lanceolate, 
pale, about equaling the involucral hairs at the base, the outer 2 scales chartaceous, 3- 
nerved, somewhat caudate-acuminate, the first one, especially near the margins, with scat- 
tered hairs almost as long as themselves, the second scale glabrous, the third scale empty, 
faintly 5-nerved, membranous, the fourth scale hyaline, enclosing a hermaphrodite flower, 
and bearing at the apex a bristle-like straight awn about as long as the scale. 
TYPE LOCALITY: Jamaica. 
DISTRIBUTION : Known only from the type locality. This may be only a form of the Old World 
E., Ravennae (¥,.) Beauv., perhaps introduced into Jamaica and escaped from cultivation. It has 
not been reported recently from there. 
14. POLYTRIAS Hack. in E. & P. Nat. Pfl. 2’: 24. 1887. 
Perennial grasses with flat leaf-blades and the inflorescence consisting of a single spike- 
like raceme with an articulate rachis of many internodes. Spikelets awned, 1-flowered, 
the flower perfect, or that of the pedicellate spikelet imperfect, in 3’s at each node of the 
rachis, the primary one on a pedicel and finally deciduous alone, with a sessile one on each 
side, both of which are deciduous with the rachis-internode. Outer 2 scales equal, mem- 
branous, muticous; third scale wanting; fourth scale hyaline, bearing at the apex a per- 
fect awn. Stamens 3. Styles about equaling the stigmas which are exserted from the apex 
of the spikelet. 
Type species, Polytrias praemorsa Hack. 
1. Polytrias amaura (Biise) Kuntze, Rev. Gen. 788. 1891. 
Andropogon amaurus Biise, in Jungh. Pl. Jungh. 360. 1854. 
Andropogon diversifiorus Steud. in Zollinger, Syst. Verz. 58. 1854. 
Pollinia praemorsa Nees; Steud. Syn. Gram. 409. 1855. 
Polytrias praemorsa Hack. in BE. & P. Nat. Pf. 2?: 24. 1887. 
Polytrias diversifolia Baill. Hist. Pl. 12: 319. 1894, 
Stems creeping, sending up erect or ascending branches up to 3 dm. long; leaf- 
sheaths glabrous; blades flat, 2-5 cm. long, 2-4 mm. wide, long-hairy; spike-like racemes 
2-4 cm. long, densely villous; spikelets oblong or linear-oblong, 4-5 mm. long, pubescent 
with long brown hairs below. 
TYPE LOCALITY : Java. . 
DISTRIBUTION: Introduced into Grenada; native of Java. 
ILLUSTRATION: DC. Monog. Phan. 6: pl. 1, f. 13. 
15. ISCHAEMUM L. Sp. Pl. 1049. 1753. 
Colladoa Cav. Ic.5: 37. 1799. , 
Meoschium Beauv. Agrost. 111. 1812. 
Ischaemopogon Griseb. Fl. Brit. W. Ind. 560. 1864. 
Usually perennial grasses, often tall, with flat leaf-blades which are convolute in ver- 
nation, and compressed spike-like racemes which are borne singly or in pairs at the apex 
of the stem and its branches, corymbose-fasciculate, or subpauiculate. Spike-like racemes 
